Just Me In Teams chat appearing whenever a user gets external calls. - Microsoft Q&A

Users are not able to chat with external users, and policies cannot be - Microsoft Community

Chat window appears blank : r/MicrosoftTeams

User can't message another specific external user (both using teams) - Microsoft Community Hub

External users appearing as Unknown User in Teams Chat (Desktop, Web and Mobile) - Microsoft Q&A

Expert Microsoft Teams Solutions

Comunication with users flagged as - External on Ms Teams - Microsoft Q&A

Guest user cant chat - Microsoft Community Hub

Top 5 things to know about private channels in Microsoft Teams – ROBERT SCHOUTEN

How to collaborate with external users in Teams

Teams guest unable to join meeting chat - Microsoft Community

How to Remove External user In MS Teams individual chat - Microsoft Community

User can't message another specific external user (both using teams) - Microsoft Community Hub

Microsoft Teams Chat With External Users [NEW] Everything About Guest Access