Can't enter new credit card

The credit card I had on file no longer exists, so I got an email this morning from Ring saying I needed to put in a new card. I went to my account, clicked on "Update" in the payment method, and a pop-up gives me the option to either delete the payment method or replace. I tried replace, and a form for a new credit card flashes up for less than a second and returns to the delete or replace. I've tried both the web page from a desktop, and on my phone. Same behavior. There doesn't seem to be any way for me to provide a new credit card. I guess Ring doesn't want me to re-up?