Letsencrypt generated Certificate is not accepted in Origin Server

I have certificates and keys from Lets Encrypt, the Cert is a fullchain.pem where it has multiple certs. The certificate is installed via certbot into Nginx, however, when I try to paste the certificate into the origin server, I am getting “Invalid CSR, bad format or invalid signature. (note: private key or certificate is not valid CSR) (Code: 1008)” .
Can you help with thid?

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