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You can't send messages because you are not a member of the chat. - How do I rejoin?
Howdy, I was in a recurring meeting a couple weeks ago and afterward people were chatting so I guess I clicked to leave the chat in order to not keep getting notified. This week I rejoined the m...
Hey Kelemvor333,
I have this same message and found it related to the Teams preview feature allowing separate windows for chat and meetings.
I was able to solve this issue by double clicking on the calendar icon in the meeting header which opens a new window and allows for chat.A non-intuitive experience for sure.
Kelemvor333
The only solution I have found is to DM someone in the group who has authority to add members and ask them to add you.
If you look at a channel or chat you are a member of, you will see in the members pulldown upper right the option to add or leave. In the chat or channel you are no longer a member of, you have no Add option.
Non-members cannot post content, files, or add members.