Amazon Pay Plugin not working

Hello,

Tried setting up using the connect to amazon pay button which didn’t work (just displays white blank page), managed to connect with JSON/PEM manually.

When I try to click any of the Amazon Pay buttons they do nothing at all (nothing added to log) if I click the classic option on checkout it just keeps spinning and never redirects to Amazon, The log doesn’t seem to show any errors all it shows is the following:

[26-Jul-2023 07:37:58 UTC] 1J0yGe - WC_Gateway_Amazon_Payments_Advanced::process_payment - Info: Beginning processing of payment for order 29411 for the amount of 29.99 GBP. Checkout Session ID not available yet.
[26-Jul-2023 07:37:58 UTC] 1J0yGe - WC_Gateway_Amazon_Payments_Advanced::process_payment - Creating checkout config for order #29411.
{
"publicKeyId": "(removed)",
"payloadJSON": {
"storeId": "(removed)",
"platformId": "(removed)",
"webCheckoutDetails": {
"checkoutMode": "ProcessOrder",
"checkoutResultReturnUrl": "https:\/\/(removed)\/checkout\/order-pay\/29411\/?pay_for_order=true&key=wc_order_s0IUecXntVwTj&amazon_payments_advanced=true&amazon_return_classic=1"
},
"paymentDetails": {
"paymentIntent": "AuthorizeWithCapture",
"canHandlePendingAuthorization": false,
"chargeAmount": {
"amount": "29.99",
"currencyCode": "GBP"
}
},
"merchantMetadata": {
"merchantReferenceId": 29411,
"customInformation": "Created by WC_Gateway_Amazon_Pay\/2.5.0 (Platform=WooCommerce\/7.9.0)",
"merchantStoreName": "(removed)"
}
},
"signature": "WJwH+GkpGMGLIa0y7E1w4Ej2vDDmkZQ68Ed9y51uekdT04Aho6Utp38MFlX2Y4+uS5bu\/RbnxysUXgzOvyy5rHO3oOSq0YL9wAa0gufZNSyO44SVkKPj0\/3FTVJxmtfV6AXfOOauf9X3BM2RcHdpVF7VDCF1+4NWoPlcnosWsgU4paiyZs6(removed)"
}

After clicking the classic option I can see the URL also changes to : https://(removed).com/checkout/#amazon-pay-classic-id-that-should-not-exist

Any help would be appreciated as unsure what to test next