Remove-PnPGroupMember - Error occured: Invalid request.

[S44dHumayun]

I am running "PnP.PowerShell".
Version: "1.6.25-nightly".

I have multiple SiteCollections that i want to remove a member from. So wrote a ps1 script to do the job. For most of the sites the cmdlet "Remove-PnPGroupMember" worked fine. But i have some sites that i won't run on. It returns "Error occured: Invalid request". I can remove the Permission manually, but i have more than 150 sites to go through. Anyone with a similar problem? How can i solve this?