Removing the app is the easiest/fastest way, re-consenting takes just a second. If you want to remove a specific permission only, you have to use the Remove-AzureADOAuth2PermissionGrant cmdlet against a given permission/scope, which you will need to enumerate first via Get-AzureADOAuth2PermissionGrant.
How to revoke admin consent from Graph explorer
Kenny Stern
371
Reputation points
I granted admin consent to a Microsoft Graph permission that I would like to remove. Is there a way to do that? I don't want to delete the application or remove any of the other permissions. Just the one I mistakenly granted.
Thanks