Hi @andrewison,
Thank you for your post and welcome to the Community Forum!
Our system reviews every payment before it's completed and sometimes, for security reasons, a payment method may be made unavailable. Unfortunately, we would not be able to manually change the security settings. However, you can try clearing your cache and cookies, deleting your browser history and waiting for 48 hours without accessing your account to let the system reset. This may help you solve the issue!
I hope this helps!
Martina
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