TLS Encryption : Need Help on "x509: certificate signed by unknown authority" / Unclear documentation

Error:
020-09-22T10:18:27.214Z [ERROR] agent.anti_entropy: failed to sync remote state: error="rpc error getting client: failed to get conn: x509: certificate is valid for server.dctest.consul, localhost, not server.dc1.consul"

This is causing issues further down the line when i am trying to add new client agents. With ACL

Similar issues -

@blake