Teams tag is mainly focused on the general issue of Microsoft Teams troubleshooting. According to your description, your question seems related to phone number validation during Azure Subscription. We recommend you use one of the contact numbers from here - https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2 and created a support ticket.
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