Facebook - Cannot disable sandbox mode after Privacy Policies update
After a few Facebook alerts about my app lacking privacy policies (totally forgot about it and the email address was not my own), my app was taken down. So, I updated the apps Privacy Policy and ToS, saved changes and tried to disable sandbox mode so my app became visible again.
Nothing happened.
It keeps showing me an error message: 
Is there something I might be doing wrong? The Privacy Policy URL and ToS URL are the only things I changed, and the app worked fine before.
Thanks in advance
UPDATE
It is not a problem with the privacy policy update, but with the basic app settings. Whe I try saving the app without removing sandbox mode, it still shows me the error. Has anything changed since, or the Facebook service is having problems?
Turns out Facebook no longer accepted the tilde (~) as a valid url character.