Adding ESX Computer Resource - Load DataCenters - Failing

Problem:
When adding an ESX Compute Resource, I am able to provide all vCenter details (including credentials) and authenticate to vCenter. The connection test succeeds and I am able to see the fingerprint, locations, organizations, etc. for vSphere. HOWEVER, the one thing that does not populate (and nothing shows in the drop down) is DataCenter. I have tried authenticating with my personal admin account, as well as the local vSphere Administrator account. I get the same behavior each time.

Expected outcome:
That the available DataCenters show in the drop-down menu which would allow me to move forward with adding the compute resource.

Foreman and Proxy versions:
1.19

Foreman and Proxy plugin versions:
foreman-vmware-1.19.0-1.el7.noarch

Other relevant data:
Please advise on which log may be of interest

I was able to resolve this. I passed in my login using the name as part of the username. Eg. domain\username, and then my password.