Hi, I'm John! I will help you with this.
To cancel Power BI Pro, you must have access to the account that originally purchased the license. Without signing in to that account, the subscription can’t be canceled.
If you no longer have access to the account, the next step is to contact Microsoft 365 Business Support directly.:
https://support.microsoft.com/topic/customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2 They’ll ask you to verify your domain ownership and can help reset the MFA requirement so you can get back into your account.
Or, you can create a temporary trial Microsoft 365 Business account and use it to reach Microsoft Support directly through the admin center, that often helps you connect with the right support team faster:
- Create a trial account here: https://www.microsoft.com/microsoft-365/business/microsoft-365-business-standard-one-month-trial
- Using the trial account, Sign in to Microsoft 365 admin center https://admin.microsoft.com
- Select Support > Help and support, enter your question and select Contact support.
I really hope this information is helpful! Let me know if you have any further questions or concerns.
Regards,
John J.D.