Can't add payment method to renew domain

I have a few domains that have renewals coming up in 7 days, but I can't add a payment method to my account. I have the same error as the person in this post: https://community.cloudflare.com/t/failure-to-add-payment-method-to-existing-und-new-services/760557

I also opened a support case # 01447718

Anyone have any idea what might cause this?

I cannot even upgrade to a Pro account.
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