Cannot buy Pro Plan, I get a "Method not allowed" error

I am trying to buy a pro plan for one of my website but I get a 404 error and a Method not allowed error multiple times until I’m locked out and cannot connect to my account anymore.
This happens once I check out after having filled everything regarding my credit card. My credit card is totally fine, I use it for paypal, and my everyday life, thus this cannot be the issue.
I have already contacted Cloudflare about this but wanted to know if you had met this issue before,
Thank you

Sorry, I haven’t encountered that. It just sounds like some sort of error. Have you tried a different browser with a cleared cache/cookies/etc?

And post your ticket #. Sometimes the mods check in on tickets to see if the issue is being addressed.