Lost TuneIn about 3-4 weeks ago. Held off on posting, until I hard reset (pulled the fireman's loop and battery negative terminal. Still nothing. Streaming OK.
I'm a hold out, on Version 8.1 (2018.34.1.3dd3072). I don't suppose the OP is on older firmware? I just prefer its features and don't aim to get into it here, about all the wins/losses of "upgrading". I lost the cell phone app, shortly after the pandemic began. Wasn't using it, from home anyway, but if things like TuneIn are missed. Currently no intent to change versions, might switch brand of car or prepare to go offline from Tesla more completely. They've been good about not forcing updates, so far.