SharePoint Comments @mention Error

[PLove59]

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.

PLove

[#2]

@PLove59Yes, We did and I am not sure whether Microsoft will increase this limit. 

[#3]

@Firthouse Azad @PLove59 

I have also faced issues while mentioning more than 10-12 people in single comment. Sometimes it just shows mention{10} instead of user names: 

I will suggest you to:

1. Raise support ticket with Microsoft to inform this bug: Get M365 support - online support 
2. Submit new idea/feedback if there is any hard limit for number of mentions: SharePoint Feedback Portal 

Related articles:

1. SharePoint Online: All you need to know about Commenting in Lists 
2. SharePoint Online/Microsoft Lists: @mention people in list comments 
3. SharePoint Online/Microsoft Lists: @mention people in list comments using SharePoint REST API 

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