There is no fix. I just spoke to GM, and they claim that the problem is due to the fact that TuneIn app stopped supporting integration with MyLink. Note that in my case - 2015 model - the TuneIn app never worked from day one. So, I am not sure there has EVER been a version of TuneIn with which MyLink worked. To sell a car with KNOWN issue is pretty bad on part of GM - they should have disabled TuneIn in MyLink altogether, that would have been more honest and transparent.