Hang in there. I actually snail mailed my verification to them also. I was finally approved for the Marriott last week and my second app is now 2 weeks msg, which usually means approval. I don't think they would have you go through all that for a denial.
Starting Score: 589/599/598 5/8/14
FICO® Score 8: EX 788 TU 791 EQ 785 05/09/23
Goal: Was 740 across all bureaus. DONE!