You started using Microsoft Teams and someone didn’t understand the difference between folders and channels.
Folders vs Channels
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Some folders were created the SharePoint library. Now you’ve decided that these folders should be turned into channels.
Quite a common issue isn’t it?
Folders in SharePoint
Well this is no problem at all just create a channel with exactly the same name as the folder and Microsoft teams will create a channel with the existing folder
This doesn’t work. Creating a new Channel with the same name as a folder that already exists, throws an error in Teams.
Can you supply the error please, as it works for me.