For reference, it works for me now. I didn’t do anything and I have no idea how it suddenly worked. For anyone who might encounter a similar problem: This is after 18 hours I made the first $10 payment, and slightly more than an hour after I made the second $5 payment. During this time I contacted Help 5 times, in the last time they made sure to have some real person contact me via email in 3 days. Then around an hour later, everything starts to work just fine.