Removing existing teams or channels from Microsoft Teams when no longer needed
Dear IBN.
Good day!
Thank you for posting to Microsoft Community. We are glad to assist!
Based on your description regarding "Microsoft Teams channel disappearing from application". May I double confirm that Viewing chats and channels set to Separate? To check this kindly go to three dots(...)-->Settings-->Chats and channels--> then Make sure that Viewing chats and channels set to Separate And Make sure that Filters turned off (Kindly see below screenshot) then check if it will make any difference
May I please confirm that you get same situation in both Teams for Desktop and Teams on Web (https://teams.microsoft.com/)?
Looking forward to your response!
Best regards,
Inema |Community Moderator