Issues connecting after migration of accounts

Hey yall!

so I have a problem that I have been dealing with for the past 3 years and I wanted to finally ask because support isn’t doing jack squat for me. 

3 years ago I changed my account email or migrated my account. That was a mistake. So I then changed it back to my original email. If you need more info it was Xbox to Gmail to Xbox. After transferring to Xbox the last time I not cannot connect online anymore. It simply says that online will be unavailable.

please help me or come with any solutions or ideas