Hi @Kalin Trifonov •
Thank you for sharing your issue on Microsoft Q&A.
I Understand that your personal email address has been associated with your former company's Azure tenant, and you are unable to access the Azure portal as a private user. To disconnect your personal email from the old work account/tenant.
You may need to have the administrator of your old company's Microsoft Entra (Azure Active Directory) tenant remove your personal email from their organization's directory. If you still have contact with someone from that company, ask them to either remove or deactivate your email as a user in their directory.
If the issue persists and you don't have access to an administrator from your old company, you can try using a different Microsoft account or create a new account. Log in to the Azure portal using this account and create a support request to address the issue.
creating a ticket through a different account: https://learn.microsoft.com/en-us/microsoft-365/admin/get-help-support?view=o365-worldwide#phone-support
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Harshitha Eligeti