tls: failed to verify certificate

[adibrastegarnia]

After linking two clusters, the link status returns the following error. Any ideas how we can debug this? Is this could be related to proxy?

 skupper link status --kubeconfig cluster-002.yaml -n interconnect

Links created from this site:

         Link cluster-89c21742-54d5b989cc not connected (Failed to redeem claim: Post "https://skupper-router.interconnect:8081/cluster-89c21742-54d5b989cc?site-version=undefined": tls: failed to verify certificate: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "skupper-site-ca"))