when installing using the operator and folllowing the instructions here https://access.redhat.com/documentation/en-us/red_hat_3scale_api_management/2.6/html/installing_3scale/onpremises-installation#getting-admin-portal-url-ocp-operator it is mentioned that to get the admin url you could call:

oc get tenants

but this really results in:

No resources found.

It would be better to ask to execute this https://access.redhat.com/documentation/en-us/red_hat_3scale_api_management/2.6/html/installing_3scale/onpremises-installation#getting-admin-portal-url-ocp-template