Inbox problem- my first booking on VRBO

I have a trip booked for tomorrow and this is my first time using VRBO. I’m beyond frustrated. When I created an account after downloading the app, I just signed in with my Apple ID. Once I decided to actually book a reservation, and keep the app, I changed my email to a gmail one. Now, when I log in, on app or desktop, I can see my trip but it won’t let me see my inbox or contact the host. It says “It looks like you’re logged into an account that’s not connected with this trip. Try logging in with a different email address.” So I signed out and tried logging in through Apple again, but then my booking doesn’t show up. I contacted customer support but they weren’t any help. Someone please help, I’m so frustrated.