Amp checkout not working on mobile device

Hello,

I am using the Official AMP plugin with Woo Commerce and I am having trouble while checking out using a mobile device on amp pages.

On a desktop amp page (with amp url) I am able to checkout successfully and land on the thank you/order-received page after checkout and the order shows up in the woo orders queue wp-admin.

However if I use a mobile device to checkout on amp page. i am able to check out but instead I see the following screen shot message and the completed order DOES NOT show up in woo order wp-admin order list and I dont arrive to the “Thank you” (order-received url) page after checkout. I see this screen shot.

https://prntscr.com/tqltoc

I few things to note:

1. I tried working from both a clean barebones WordPress 2020 and Storefront theme with no other plugins besides Official amp plugin and woo commerce installed.

2.Tested it as “AMP in desktop browser ” and “AMP in mobile browser” and used same form fields data in both variants on same IP address.

3. I tested it using COD (cash on delivery method) so it doesn’t need to use any payment gateway plugin to return a successful order.

I can’t understand what the issue is and why I see this screen shot instead of successful checkout thank you page.

Please help explain when you can and advice is greatly appreciated.

Thank you,
Anthony

The page I need help with: [log in to see the link]