Communications sites should not be created in the same managed path as Groups sites. They are not managed the same way and don't follow the same rules.
At least, allow the selection of the path on the create screen.89 votesin the plans · AdminSharePoint UserVoice Admin (SharePoint UserVoice Admin, Microsoft SharePoint) responded
We are planning to provide a path selection mechanism in the new admin center, but until then we’ll look to at least amend the PowerShell (note that you can already set the path using PnP PowerShell – specifically, the New-PnPTenantSite cmdlet).
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