Deleting existing users from SDL Trados GroupShare

Dear

I'm a project manager at a language provider. We use SDL Trados 2017 and GroupShare (serverbased TMs and term banks)

Even if I have administrative rights for my user on SDL GroupShare server, I can't delete old users.

When I select the user and click "delete" I get the following error message: "The underlying provider failed on Open".

Coud you assist me on this?

Kind regards

Mika Kirvesniemi