Can't add a debit mastercard

Hello.

I’m trying since 17/11 to add a Greek debit MasterCard to Curve app for Android but it doesn’t accept it.

I keep getting an error message saying “Your card couldn’t be added this time” every time I’m trying to add it, and it prompts me to either press an “Ok” or a “Contact Support” button.

The card is a new one and it’s valid thru 05/23.

I have sent two messages after pressing the “Contact Support” button but no one replied.

I have also sent an email to support, and the lines I wrote describing the problem have been copy-pasted inside the in-app chat but no one replied either.