Tough experience, BillBryan. I imagine it will never happen to you again, that is if you are willing to take the assignment a next time. With this MSC, there may be options. Even bonused shops sometimes can be rescheduled for the next day, or next. Self-assignment can save the day.
If you don't read the guidelines, or miss something, that's just us being human. I've had a few invalidations with the MSC. I've appealed and won all but one. It was totally my fault, so of course I did not appeal. Was a retail store and the guidelines were that if I was not assisted within twenty minutes, I was to leave the store. Totally flubbed that one, as I had not thoroughly read the guidelines, and frankly, it's an unusual requirement. Leave the store without being assisted, without making a purchase for proof, and get paid for it?! At that time, it seemed unheard of, at least to me.
mystery2me ~ Thanks for the laugh