Problems with Curve Cash

Dear Curve Team & Beta Testers,

I have a problem with Curve Cash. Whenever I try to pay with it at PayPal for things it is rejected, although the account balance is sufficient (see screenshot). Does any of you have problems with it or is it known?

Best wishes

(IOS 14 | Curve App Beta 3.5.6 (4844))
[Feedback with App was sent]