Hello @ahmed fehr ,
Based on your issue description, it appears that you are unable to log into the Partner Center or Microsoft Entra ID portal due to an incomplete MFA process. Since you have lost access to your mobile phone which is registered for second-factor authentication and not getting any MFA prompts, you are unable to complete the authentication.
In such scenarios, another Global Administrator from your Microsoft Entra ID tenant can help to re-register MFA on a new mobile device. However, since you mentioned that you are the only Global Admin in your tenant, this qualifies as a tenant lockout scenario. To resolve this issue, we need to engage the Data Protection team via a support ticket to unblock your access.
To proceed further, I will need a few details from you. As this information contains Personally Identifiable Information (PII), please share the following details via private message:
Contact phone number (add +Country code)
Contact email address
Global admin email address (affected account)
Country
TimeZone
Please send me the above requested details via private message so that we can involve the Data Protection team via a support ticket to unblock your access to the Entra ID tenant and resolving this issue.