Hi @Ludvik Jerabek ,
I recommend creating a ticket with the subscription/billing team to get this resolved. https://azure.microsoft.com/en-us/support/
If you're getting blocked because of the cell phone number and you have provided a valid number, you may receive that error message if you are not including the country code in the number.
If you have verification options, you can try again by selecting a different option. If your account is fully blocked, you may need to have a global admin let you back in or reach out to the Azure Data Protection team to get access again if there is no other global admin.
Hope this helps.
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