I’m in the same boat. I’ve had this problem for a few months now. There’s nothing support can do. There’s been a few suggestions, none of which works, like setting up a new MioNet user account. That works for about 2-3 days, then it’s back to Error 688. I don’t understand why this is happening.
I was told by a support tech that it’s their server-side issue, apparently. Which puts us straight out of luck in terms of fixing it ourselves.
This shouldn’t be advertised as a feature, it doesn’t work!
But when it does, it’s really cool. So sad about this