SharePoint Comments @mention Error


Hello All,

My VP reported an error message that he received while trying to add @mention to the Comments of a SharePoint Online News post.  After adding 12 @mention names he received the following error messages:  "Could not complete that action" and "Couldn't post comment. Try again."  Has anyone seen these error message when attempting to post Comments?  Is there a limit to the number of @mention names you can enter in a Comment?  A screenshot of the error message is attached.  Thank you in advance for any assistance.


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