I had this happen to me recently and the track came up with a content ID. I contacted Tunecore and they are very slow to respond and keep asking what my account login is with them (I don’t have one) what video I uploaded the track to on Youtube (I didn’t, someone else did and emailed me) etc. It’s very frustrating. Has anyone else had this problem before?
Yep, it happens. This is why all authors should register their tracks.
But. It may be a false positive as well.
Here is a guide about CID