Apple Pay Merchant Identity Certificate - renewal problems

We are having trouble trying to renew our Apple Pay Merchant Identity Certificate. We can create the CSR file and add to the developer portal. We then convert this to a .pem and then a .p12.

When we test the certificate in Postman however, we see the following error:

"statusMessage": "Payment Services Exception pspId=xxxx unauthorized to process transactions on behalf of merchantId=xxxx reason=xxxx is not a registered merchant in WWDR and isn't properly authorized via Mass Enablement, either.",
"statusCode": "417"

We are sending the following POST request to 'https://apple-pay-gateway.apple.com/paymentservices/paymentSession':

{"merchantIdentifier": "merchant.com.xxxx.applepaytest",
"domainName": "beta-xxxx.com",
"displayName": "beta-xxxx.com"}

Anyone got any ideas what the issue may be?

In the meantime I will look at completing our domain verification as that is also due soon and we thought it may possibly have something to do with the certificate issues we are seeing.

Apple Pay Merchant Identity Certificate - renewal problems
 
 
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