Important: You must be the the owner of a team's Microsoft 365 group or an admin. If a team has been deleted for 30 days or less, it can be recovered by restoring the associated Office 365 group through Outlook on the web:
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Log in to Outlook on the web, right-click the Groups node in the left navigation bar, and select Manage Groups.
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Choose Deleted and select Restore on the group to restore.
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If the deleted group doesn't appear here, or won't restore, contact an administrator.
If you can’t see this option, talk to your administrator. For more info, see Restore a deleted Office 365 Group.