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Thank you for the fast reply. The issue is solved.
One hour after your reply, I successfully received the first email verification request Action needed: Verify your email account with Microsoft, and one hour after that another one.
Unfortunately, both resulted in the following error: The request is blocked. I assume this is because I closed the current validation request and created a new one.
However, just 10 minutes ago I received a confirmation email for the new request, stating that the validation status has been updated to pass.
Thanks for sorting this out.