Is anyone else experiencing this? My accounts are merged and I can book former-Marriott properties with no issue but when I try to book a former-Starwood property I always get this error:

We're unable to locate this Starwood Preferred Guest® account, or you have entered an invalid SPG number. Please re-enter or remove your SPG number, check that the last name you have entered below matches the name on the account, or contact us for assistance.

I've been emailing back and forth with support for a week and they can't seem to figure it out and no one is picking up the phone. The screen shows my correct new number and the name is correct.