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Is there a limit to the number of chats, teams, and channels that can be pinned or grouped together in a Section? Is there a limit to the number of Sections that a user can have?
I would check out https://adoption.microsoft.com/files/microsoft-teams/chat-and-channels/Microsoft-Teams-new-chat-and-channels-experience_User-guide.pdf . It is the best documentation I have found so far.
It states that there is a maximum of 50 sections with 50 items per section.