Stuck at migration to Fab

I’m trying to set up an account to migrate my Sketchfab models to Fab before the deadline. However, I am stuck with the trader verification part. No matter which option I clicked, there was a message “We are unable to complete your request at this time. Please try again later.” I have been trying it for the past 2 days and still can’t proceed to the next page. I am still waiting for Support to respond. In the meantime, any suggestions on possible ways to resolve this issue?