Does anyone else in the organization have this problem?
Is there any error message?
I tested and private and shared channels don't appear in the newly cloned team. Please refer to the screenshot below:
For more details, you could refer to: https://support.microsoft.com/en-us/office/create-a-team-from-an-existing-team-f41a759b-3101-4af6-93bd-6aba0e5d7635
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