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Hi @Egis Hidri
Thank you for contacting the Q&A community,
If you cant complete the MFA request you will need an admin to exclude you from the MFA policy or turn off MFA temporarily.
if you are the last admin in the tenant and cant access because of MFA you will need to open a support ticket so our data protection team can verify your tenant ownership and allow you access.
You can either open a ticket via the azure portal if you have access from another tenant or you can use the support phone numbers.
Azure Portal
Support phone numbers https://support.microsoft.com/en-gb/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
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