Hello @Graovac, Sara
I assume you have accidentally pressed 0 (default value and can be changed) which reported fraud. In this case account gets blocked for 90 days. To unlock the account immediately, you would need to contact the global administrator of your tenant. Global Administrator can navigate to:
Azure Portal > Azure Active Directory > Security > MFA > Block/unblock users
and unblock your account.
If the blocked account is a Global Administrator account and you don't have any other administrator account in the tenant, you would need to open a support ticket and provide required details which proves your ownership on the tenant to get the account unblocked.
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