OCP-4.5 IPI installation on RHV failing while creating a worker nodes due to error "certificate signed by unknown authority".

Issue

• OpenShift 4 installation fails on RHV using IPI installation format reporting the failure while getting the worker machines.

[root@master-node]# oc get nodes
NAME                       STATUS   ROLES    AGE   VERSION
ocp001s-xxxxx-master-0   Ready    master   41h   v1.18.3+b74c5ed
ocp001s-xxxxx-master-1     Ready    master   41h   v1.18.3+b74c5ed
ocp001s-xxxxx-master-2    Ready    master   41h   v1.18.3+b74c5ed

• The installation fails on getting the following operators up and running as there are not worker nodes in the cluster.

NAME                                       VERSION   AVAILABLE   PROGRESSING   DEGRADED   SINCE
console                                    4.5.3    Unknown     True          False      51m
ingress                                    unknown   False       True          True       54m
monitoring                                           False       True          True       49m

• The install-config.yaml is configured with 3 replicas for worker nodes but still, the worker nodes are not visible.
• The logs of the machine-controller container in the machine-api-controller pods report the following error.

020-07-21T13:46:31.009122693Z E0721 13:46:31.009066       1 machineservice.go:307] Failed to fetch VM by name
2020-07-21T13:46:31.009157701Z E0721 13:46:31.009102       1 controller.go:279] Failed to check if machine "ossxxx-xxxx-master-0" exists: Post https://xxxxxxxx/ovirt-engine/sso/oauth/token: x509: certificate signed by unknown authority