Tried to buy a vehicle today and was financed thro...

Tried to buy a vehicle today and was financed through my credit union. They would not accept a draft letter?? I ve never heard of a dealer saying I had to finance with them only and not my credit union. I called several other dealers and they all accept credit union and bank draft letters. too bad.. I wanted this vehicle! Blamed it on Covid. I work in this business and we accept all financing, too bad I can t trade for what I want