Lienholder needs Letter of Total Loss

Hello, I got approved for a car loan, signed all the papers and got the spare key, but they said the credit union approving me needs a letter from my insurance stating the vehicle was a total loss. I gave them the settlement breakdown and the valuation report which states it’s a total loss several times.

This was Friday afternoon, so the dealership said I’ll have to wait til Monday to hear back from the credit union but I’m already approved so is it possible they can say no and all the paper work I signed gets 86’d?

The insurance settlement didn’t cover the entire loan, so gap insurance took most of the remaining chunk out of the loan. I still owe $885 on the car so I worry that could prevent me from getting the OK from this credit union.

I emailed my insurance rep and asked if she’d be willing to get me a letter just in case the VAL report isn’t enough.

Does anyone know what I might be able to expect?