[Solved] Office 365: Unable To Add Signature Fix in 2024

Written By Farhan Max

The signature is essential to make an email look more professional, creating markets and spreading brand recognition.

More than 62% of brands use signatures in their emails. 82% of them use it for spreading brand awareness and the marketplace.


A signature makes your email elegant and differs from an ordinary email which keeps you ahead in the marketing competition. An attractive signature benefits a company, while a repulsive signature can create a negative impact.

But, not being able to add a signature can slow your company’s progress. Users can’t add a signature because of bugs, glitches, and update problems in Office 365.

This article will help you to fix the issue of being unable to add signatures in Office 365 in the most effortless way.

Why is Office 365 Unable to Add Signature?

Office 365 can’t add signatures due to errors and update issues in Office 365. Bugs, glitches, and corrupted files can create problems in the Office program. Additionally, the setup keys in the registry can prevent you from adding a new signature.

You can clearly understand the issue by going through the reason. To know better about the cause, continue reading the articles.

Here are the reasons behind not being able to add a signature in Office 365:

Office 365 Error

Office 365 can restrict you from adding a signature because some features are not working correctly. They can be broken, or there are some glitches in Office 365. Corrupted data files can create malfunctions in Office programs.

Update Issue in Office 365

Your current Office update may contain bugs and glitches. They can prevent you from adding a signature in Office 365. While updating, some features might be broken or not installed accurately.

Registry Problem

Specific registry setup keys can prevent adding signatures in Office 365. Changes in the registry can be crucial. You need to be focused while modifying the directory.

If you see any similarities or face this situation, the following solutions should help you overcome the issue.

Also, check out our separate post on how to view message headers in Outlook.

How to Fix Unable to Add Signature in Office 365

Unable to add a signature issue in Office 365 can be solved by repairing Office 365 suite, creating a new Outlook profile, and using an inbox repair tool. Additionally, reinstalling and tweaking the registry editor can fix the signature-adding problem.

It’s a common problem with the user. But, it can be new to you. Consider reading the article to learn about the solution broadly.

Here are the steps to fix not being able to add a signature in Office 365:

1. Repair Office 365

If any features of the Office program do not work perfectly, repairing Office 365 is the most effortless solution to fix any issues or malfunctions. Repair your Office 365 application using the built-in repair tools.

Here is the process to repair Office 365: 

  • Open the Control Panel.
  • Click on the Programs and Features. program-and-features
  • Find Office 365 and right-click on it.
  • Choose the Change option.
  • Select Quick Repair or Online Repair.
  • Confirm the process by selecting Repair. repair

Repairing the Office 365 program should fix any bugs or problems in the Office program. It should resolve the issue of not being able to add signatures.

Follow our guide to know do Microsoft points still work.

2. Create a New Profile

Files in your current profile can be corrupted. They are obstructing you from adding a new signature. Try creating a new profile to see if the feature works perfectly.

Here are the procedures to create a new profile: 

  • Go to the Control Panel.
  • Search mail from the search box in the right top corner.
  • Tap on the Mail (Microsoft Outlook) option.mail-signature
  • Select Show Profiles.
  • Click on the Add button.
  • Type a profile name and press OK to confirm. mail-ok

Now, go to an Office application and see if the signature feature is working correctly. If the problem remains, follow the below procedures.

Follow our guide to fix Office 365 temporary server down problem.

3. Run the Inbox Repair Tool or SCANPST.exe

SCANPST.exe is an inbox repair tool to repair Outlook data files. Corruption or error in data files can prevent users from using the signature. Repairing the data file can work as a quick fix.

Here are the ways to run SCANPST.exe (For Outlook 2019 & 2016):

  • Open the file explorer.
  • Go to the location,

C:\Program Files (x86)\Microsoft Office\root\Office16

  • Launch the SCANPST.exe file.scanpst
  • Locate and select the Outlook data file.
  • Press on Start.
  • Tap on Repair. scanpst-repair
  • Open Outlook and check if the signature feature works. 

Check out the easiest way to fix Office 365 stuck.

Here are the steps to run SCANPST.exe (For Outlook 2013):

  • Go to the file explorer.
  • Navigate to the location,

C:\Program Files (x86)\Microsoft Office\Office15

  • Search and open exe.
  • Find and open your Outlook data file.
  • Tap on Start.
  • Click on Repair.
  • Reopen Outlook to see if the signature works appropriately.

Repairing with SCANPST.exe should solve the issue if you have a problem with the Outlook data file.

4. Reinstall Office 365

Office 365 wouldn’t work correctly if the Office files didn’t install successfully. Additionally, using a trial version can be a reason behind the signature issue. You need to uninstall Office 365 entirely and install a new Office program.

Here is the process to uninstall Office 365:

  • Go to the Control Panel.
  • Tap on Programs and Features.
  • Find Office 365 and tap on it.
  • Click on Uninstall and finish the uninstall process. uninstall-office365

After completing the uninstallation process, install a new Office 365 program from the official website.

Here are the steps to install Office 365:

After a fresh install, check for the signature feature to see if it’s working accurately.

5. Remove Office Setup Key from Registry

Specific Office setup keys in the registry file can block users from using signature features. Delete the key files from the registry to fix the problem.

Caution: Registry editors can be critical, so be aware while modifying the files.

Here are the procedures to remove the Office setup keys: 

  • Press Win + R to open the Run program.
  • Type regedit and press OK.regedit
  • Tap Ctrl + F to search.
  • Paste 0006F03A-0000-0000-C000-000000000046 and click on the Find Next. search-key
  • Delete by right-clicking on the folder. delete-key

Search for the same key again. If found, delete the folder and confirm the key is deleted completely.

6. Contact Support

I believe your issue has been fixed by now. If the problem persists, try contacting Microsoft Support. The support team will provide additional support and service to resolve your issue.

We have seen users are unable to add a new signature correctly. It’s alright if you don’t know the correct procedure. Read the following article to learn about the fundamental approach.

How to Add Signature in Office 365

A signature is a vital feature attached at the end of an email. It contains your or company’s name, information, address, etc.

You can add a new signature from the Signature options in Mail. It’s a smart way to reflect your identity.

Many people aren’t aware of the procedure to add a signature in Office 365. The steps are elementary and straightforward. Let’s find the absolute way to add signatures in your Office 365 or Outlook.

Here are the steps to add a signature in Office 365 or Outlook:

  • Open your Outlook application.
  • Go to File from the top left corner.
  • Select the Options menu.
  • Press on the Mail option.
  • Tap on the Signatures button.
  • Click on the New button to add a signature.
  • Type a name for your signature.
  • Press OK to confirm.

This procedure will help to create a new signature and improve your email’s charm.

Follow our guide to know Microsoft Refund if you already purchased something from the MS Store or Xbox store.

Frequently Asked Questions

How do I add a signature in Outlook 365 Windows 11?

To add a signature, click on Signature from Message tab > Signature > Pick E-mail account > tap on New under Select signature to edit > Type a name and press OK. 

How do I change my signature in Office 365?

To change signature in Office 365, navigate to File > Options > Mail > Signature > Choose default signature. 

Why is my signature not automatically appearing?

To include a signature automatically, log in to Outlook Web Access > Options > Settings > Email Signature > Check Automatically include my signature on messages I send.


Signatures are helpful to give yourself or your company an acknowledgment. It’s a sign of professionalism and legitimacy.

Sometimes, adding a signature in Office 365 can be challenging. Unable to add it can affect the impression.

In this article, I’ve provided the definitive fix of unable to add a signature in Office 365, and I firmly believe you’ve managed to fix it by following the steps.


About The Author
Farhan Max is a tech geek with a particular interest in computer hardware. He's been fascinated by gaming since childhood and is now completing his undergraduate studies while researching and testing the latest tech innovations. Alongside his love for all things geeky, Farhan is also a skilled photographer.

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