Using @ to mention External collaborators

[MVCuser]

Hello.

We have a site that we share externally, We added them as external members so that they have edit permissions. But when working on files, and adding comments, we cannot @ them so that they can get a notification that the file has a comment assigned to them.

Is there any way to modify this please?

THank you

[#2]

@MVCuser I think this is a known limitation of mention feature in word document comments as well as list item comments.

Check for more details:

1. SharePoint Online/Microsoft Lists: @mention people in list comments 
2. Using @mention in Word online for Guest users 

---

Please click Mark as Best Response & Like if my post helped you to solve your issue. This will help others to find the correct solution easily. It also closes the item. If the post was useful in other ways, please consider giving it Like.

[#3]

Hi @MVCuser 

What kind of Site? a Team Site? Is connected to an Office Group?

This must be Governed by your Administrators to use some features, if it's not available, it's blocked. 

Collaborate with guests on a document | Microsoft Learn

[#4]

Hi. We are using a Teams site, and the external users have been added to office 365 groups as guests.