Format of "Card Number" is invalid

[#1]

I keep getting this error when I try to add my credit card. I've tried both with and without spaces. I've used different browers, Windows and iOS, and I still get the same error message. Any help?

[#2]

Hi Jeremy, 

We’ll have one of our agents reach out to you via a support ticket to assist you with adding your billing method. 

Thank you for reaching out to us.