Error when executing deis register https://deis.xx-xx.domain.com but works for http in deis V2.21.5

[Anilkumar18]

deis version : v2.21.5
helm version : version.BuildInfo{Version:"v3.3.0", GitCommit:"8a4aeec08d67a7b84472007529e8097ec3742105", GitTreeState:"dirty", GoVersion:"go1.14.7"}

When executing the command deis register https://deis.xx-xx.domain.com , we get the following error.

Error: https://deis.xx-xx.domain.com does not appear to be a valid Deis controller.
Make sure that the Controller URI is correct, the server is running and
your deis version is correct.

We used below command to install the workflow :
helm install hephy/workflow --namespace deis --generate-name --set global.use_rbac=true -f values.yaml

All the deis pods are in running state.

deis register works when doing with http:// but not https.

Any inputs or workaround for this issue?
Appreciate the assistance in advance. Thanks.