That's not particularly very satisfactory but thank you on behalf of us very frustrated Teams users! The 10/4/23 update seems to have really caused some major issues!
I've also randomly lost the ability to @ some channels. Which makes no sense. I'm in about 9 chat room in Teams at my job.
I can @ channel or @ [channel name] no problem in 8 out of the 9 channels or chat rooms. But last week logged into my laptop and voila! Just out of the blue, no changes (that I am aware of, I do have admin rights, and am usually aware when changes are made due to my role) were made.
This all happened about the same time. Teams Version 1.6.00.27573 (64-bit). Updated 10/4/23 Windows 10 Enterprise.