@Martin Meyer Thanks for sharing the details in private message. Due to the complexity of this issue, we may need a Support ticket to have a closer look at this issue.
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After initial investigation on this issue, I have helped enable a one-time, courtesy free support flag on your subscription ‘428eXXXX-XXXX-XXXX-XXXX-XXXXacc7f7c3’ for a quick and immediate assistance.
Please create a service request to formally track this issue. This helps us track widespread impact in the event other customers are experiencing similar issues.
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Details on how to raise a service request below:
• Go to the Health Advisory section within the Azure Portal: https://aka.ms/healthadvisories
• Select the Issue Name "You have been enabled for one-time Free Technical Support"
• Details will populate below in the Summary Tab within the reading pane and you can click on the link "Create a Support Request" to the right of the message
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Also once you have a resolution on this, please post it here so that it benefits other community audience.
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Please do not forget to "Accept the answer” and “up-vote” wherever the information provided helps you.