Check my Gamertag for ban

How do i know if my gamertgag is banned. There´s no pop up warning me about a ban. But i just can find any match online. My brother have another profile and can play without a problem. We both live in the same house, and made the test in the same PC.

Have you installed the recent update?
I had problems matchmaking yesterday, I could search and even found a game in social after about 10 minutes with one other player and it turned out the update had failed, which neither the game nor my xbox notified me of.
Restarted the xbox and re-downloaded the update and all fine.

I had to do the same thing except I didn’t get a notification…it was as though I never updated in the first place…It was very annoying.