Has anyone had any issue recently when enabling Seller Fulfilled Prime shipping setting - i.e. confirm button does not work and error message comes up: The website is having a technical problem, please try again.

I had to turn off my prime shipping settings for 1 day - Saturday - and I can't turn it back on now, I have a feeling I got blocked - it is taking them over a week to resolve and they just say they are working on the query and its a technical issue down to server..

I've tried changing browsers, clearing history, cookies, different devices, different time of the day and night - nothing works...

Has anyone had same issues? Any suggestions?