Forum Discussion
Email Signatures Not Syncing
It seems that you might have set up the email signature in Outlook for Windows, which doesn't sync to Outlook on the web. Outlook on the web can't have a name for a signature. To get an email signature on Outlook on the web, you need to set up a separate signature in this client (here are instructions on how to do that). You can use both the mobile device or desktop for that, but doing it on desktop is going to be much easier.
How it used to work before is a mystery to me, but it seems you simply had a signature set up in Outlook on the web before.
Microsoft has put an end to these sync issues, they no allow https://m365scripts.com/exchange-online/synchronize-outlook-signatures-to-set-the-email-signatures-to-all-outlook-interfaces/ across all the Outlook clients. No more setting of same email signature across all the Outlook clients.