Outlook, setSignatureAsync method adds a new signature but does not replace the existing one

[DmitryKostochko]

Provide required information needed to triage your issue

In an Outlook add-in for Compose mode, we use the setSignatureAsync method to add a new signature, or replace the existing one. In practice, it adds a new signature to an email draft without removing the existing one, if the draft already contains a signature created with the same method but in another Outlook platform, e.g. Outlook Online.

Your Environment

• Platform [PC desktop, Mac, iOS, Office on the web]: PC desktop, Mac, Office on the web
• Host: Outlook
• Office version number:
• Operating System: Windows & MacOS
• Browser (if using Office on the web): Google Chrome

Expected behavior

According to documentation, the setSignatureAsync method shall replace an existing signature.
https://learn.microsoft.com/en-us/javascript/api/outlook/office.body?view=outlook-js-preview#outlook-office-body-setsignatureasync-member(1)

Current behavior

The setSignatureAsync method adds signatures, but not replaces the existing one.

Steps to reproduce

1. Open Outlook Online, create a new email, open the add-in pane and execute the following code:
   Office.context.mailbox.item.body.setSignatureAsync("<div>My signature " + (new Date().toString()) + "</div>", { coercionType: Office.CoercionType.Html }, () => { });

2. Make sure the draft with the signature is saved, and then close the draft.

3. Start classic Outlook, open that draft email, open the add-in pane and execute the code above. As you can see, now you have 2 signatures. Save draft, close it.

4. Start the new Outlook, execute the code above for the same draft. Now you have 3 signatures, please see my screenshot below.

Provide additional details

1. The steps above are taken on Windows, but you can do the same on Mac using Outlook Online and Outlook for Mac.

Useful logs

• [ X ] Screenshots

[github-actions]

Here are some similar issues that might help you. Please check if they can solve your problem.

• Inserting Signature with the OnMessageSend event duplicates the signature #4758
• [Outlook][Mac] Office.context.mailbox.item.body.setAsync breaks signature replacement and causes app freeze with a certain signature #1272

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[arpitsangwanmsft]

Hey @DmitryKostochko!
Native signatures are also appended and not replaced across clients (web/mac/classic), so this behavior is not governed/controlled by the setSignatureAsync office.js API. Irrespective of whether the setSignatureAsync api is used or not, same behavior can be observed.

This forum is limited to office-js related issues. For Outlook specific queries and support please post your questions here- https://support.microsoft.com/home/contact.

Meanwhile for identifying if signature has been appended across clients please explore RoamingSettings if it suits your use case.

Thanks

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