Microsoft have created a Service Health post notifying that:
"Some users may be unable to access the My Templates add-in in Outlook. This issue impacts both the Outlook desktop client and Outlook on the web. Some affected users find that the “My Templates” icon is missing from the Outlook ribbon"
Microsoft reference: EX1255397
Microsoft are investigating, and are planning to update by Thursday 26th March at 0100 GMT.
We will update this post accordingly as that progresses.
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