I have trouble with phone number and Microsoft Authentication when login. Where can I find support?

Hello,

Currently, I am unable to log in to my email address removed for privacy reasons account. I have the password. I have a backup email address, but when I try to log in, at the authentication step, I don't have the option to receive the OTP code via email.

I can only choose to have it sent to my phone number or the Microsoft Authentication app.

But when I tried sending it to the phone number, I got the following error:

Error Code: 399287

Request Id: 4d13566b-7aa4-4b3f-a03b-0c9416841000

Correlation Id: 019f785d-514f-7eaa-b1a3-ee66302634ae

Timestamp: 2026-07-19T03:13:40Z

Also, I can't access the Microsoft Authentication app because I've changed devices multiple times.

I couldn't find the support form, so I replied to this email.

With the admin account password and backup email, how can I log into the admin panel?

Sincerely,

Thang