[Security Alert] Kept getting Microsoft Authenticator notification attempts

Question

Good day,

Hoping for anyone to help me. I have been getting microsoft authentication notification of attempt to open my account. I have done all the basic solution and was forward here by the support chat for specialized support.

I have already done:

1. Contact support for assistance
2. Change Password
3. Unregister all devices that were also mine

I still kept getting notification 1 to 3 times in a day from Netherland and unkown area. I feel not secured in Microsoft right now. Please help. I do not know what else to do.