Hi Matthias,
Are the machines cloned by chance? There was a system put in place with the last update for cloning that may be causing an issue. I haven’t seen other reports of this as of yet.
If they are clones it may take up to an hour for the backend to recognize they are clones and seperate them if they are all on at the same time. If not it could take longer.
If they are not clones, is the email you are using on the forum the email associated with the account? If not PM me the email and I’ll take a look at the account.
Thanks!
Jeff