Invalid number of certificates in pfx

ssue: Failed to create the custom domain ‘wildcard’. Error: The certificate chain includes an invalid number of certificates. The number of certificates should be greater than 2.

we have tried below methods:

  1. from cloudflare, we downloaded origin, root and private key in .pem format. Executed below command to convert to pfx. openssl pkcs12 -export -in certificate.pem -certfile cabundle.pem -inkey privatekey.pem -out certificateandkey.pfx

When we upload this pfx in azure frontdoor, below error is displaying. Failed to create the custom domain ‘wildcard’. Error: The certificate chain includes an invalid number of certificates. The number of certificates should be greater than 2.
Can anyone please help us to fetch CA bundle certificates.

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