After spending three months trying to migrate legit accounts to MSFT Auth, I agree with this comment completely. Their account migration approach is broken from the start, but more importantly, there is absolutely no customer support. What should have been a 5 minute phone call turned into a 3 month long chat and email nightmare, with multiple support reps telling me there was nothing they could do.

Apple is not really any better. God help you if you accidentally lock your Apple ID, you will be subject to a month-long wait before it can be fixed. Why that long? No idea. Nobody at Apple has any idea why it couldn't just be 2 days, and they will frankly admit to you that it makes no sense, then spout some meaningless 'because of GDPR regulations' nonsense that has absolutely nothing to do with GDPR regulation.