Haproxy tlsv1 alert unknown ca in openshift

Hello,

we are adding Haproxy between Routes and app pods to
Inbound connectivity from the F5 . Currently haproxy receiving traffic but its not able to talk to service . Failing with below errors even though ca/svc crts are added in the pem:

fd[0x65] OpenSSL error[0x14094418] ssl3_read_bytes: tlsv1 alert unknown ca
<134>Jul 23 13:48:41 haproxy[48]: 10.225.86.12:47006 [23/Jul/2024:13:48:41.198] https_frontend/1: SSL handshake failure
fd[0x67] OpenSSL error[0x14094418] ssl3_read_bytes: tlsv1 alert unknown ca

please suggest.

Thanks.