Invalid phone number linked to imessage, can't login into Messages on my Mac

Hi, somehow in the past, i managed to save invalid phone number in imessage, and now i'm unable to remove that number.

Hence i'm still using that number, i'm able to add the number in right format, but i can't login into Messages on my Mac, or even when i manage to login (don't know how, it's just happens after hours of trying), i'm still unable to sync messages with my iphone. My assumption is that, i have imessages linked to that wrong format phone number, and when i add correct format on my iphone, i have error message because it's different phone number.

Did anybody have that issue?

I tried literally everything from the internet: logout-login on iphone & mac, changing the Apple ID password, disabling-enabling the FaceTime & Messages, devices restart....