Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello Albert Kraan,
Welcome to the Microsoft Community.
Unfortunately, this has been a hot issue recently, with many users reporting similar access issues in the community. This appears to be an anomaly in the Designer service.
See this post: Microsoft Designer unavailable for account - Microsoft Community
This site is intended to provide technical advice and recommendations to users but is not involved in the development or fixing of Microsoft products. We have submitted feedback on this issue and hope it will be resolved soon.
Temporary network access issues may improve over time. So please consider waiting a while to see if the problem is resolved over time.
Best regards,
Ian - MSFT | Microsoft Community Support Specialist