After allowing administrator to recover deleted Teams, Microsoft Teams has been updated and now allows you (and I mean end-user here) to recover deleted Teams channel for up to 21 days after the channel has been deleted.

To recover a channel, the Teams owner needs to go to the Teams settings (Manage Team)

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Then you go to the Channels tab and open the Deleted group to select the channel to recover and click on Restore

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Finally confirm the recovery

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Et voilà your deleted channel is recovered