AWS API Gateway mTLS not working

Is anyone else struggling with certificates updates on AWS API Gateway?

I followed the exact same procedure as every year, whereby updating the .pem s3 file with the latest certificates.

Exactly as mentioned here: https://shopify.dev/docs/apps/build/payments/considerations#requirements

Copying THE FULL CA CHAIN.

But it just will not work, Cloudwatch reports :

Access denied. Reason: Could not find issuer for certificate

I have tried various way to overcome this but nothing is working, anyone else struggling with this?

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