My Android TV (Sony Bravia) seems to have quite randomly unlinked with my Google account. I'm logged in on the tv with my account, but the TV no longer shows up in my Google Play device list. The biggest clue is that Google Play Music stopped working and displayed a toast message about a maximum of 10 devices per library, even though I don't use anywhere near 10.
Anyone had this happen to them? Seems like quite a bizarre error.
I have the exact same issue and I tried every possible thing (except resetting phone/Shield) but never figured out a fix.