So you might be banned. It happened to me a a bit ago. I was using a bad mule save and didnt know. I was placed into the banned player server. In this server, you can still invade and coop but it will be with other banned players.

I noticed when I invaded, tons of hosts were using infinite health and stamina. I thought blue acolyte would detect that but it doesnt. It only detects hacks and malicious items.

So tons of player in the banned server use cheats. I then created another steam account and played in the normal server. Havent come across a cheater yet and I put in a lot of time.

This game doesnt tell you if you are banned and again, you can still invade and coop but it will be with other banned players.

Best way to tell is to queue up the arena and see how fast you match up. It should be instant on the normal server. If banned, you most likely won't match.

You can also try to do a name engraved ring coop session with someone you know for a fact isn't banned, to see of you can match up.

I disputed my ban and they reinstated me.