Hello @Mohit ,
Thank you for reaching out Microsoft Q&A.
I Understand that you added as a guest with your personal Email ID to your Company azure portal. However, the tenant was deleted but you want to leave from the Company tenant which is already deleted.
As the tenant deleted, the users associated with the tenant also will be deleted so the users cannot enter into the azure portal associated with that tenant. So, if you want a user to leave an organization it will be possible when the tenant which is associated with user exists.
As you mentioned that you added as a guest with your personal email ID I just want you try using the url: https://myaccount.microsoft.com?tenantId=aaaabbbb-0000-cccc-1111-dddd2222eeee and check are you able to leave your organization or not.
NOTE: In place of tenantId=give your tenantID
For more information you can go through with the following document: https://learn.microsoft.com/en-us/entra/external-id/leave-the-organization?source=recommendations
Hope this helps. Do let us know if you any further queries.
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