Can't Configure Local Site for SRM plugin 6.5.1.1 on vRO 7.3

Hoping someone can help answer.  Have vRO 7.3.  Have SRM 6.5.1.  Have multiple vCenters setup in vRO.  Have SRM Site Pairings between them already setup.

I'm trying to configure the vRO Plugin.  Plugin installed just fine.  Problem running the 'Configure Local Sites' workflow.  Receiving the following:

[2019-02-13 13:53:50.320] [E] Error in (Workflow:Configure Local Sites / Get SRM Urls (item1)#1) URI of the local Platform Services Controller is not valid

[2019-02-13 13:53:50.336] [E] Workflow execution stack:

***

item: 'Configure Local Sites/item1', state: 'failed', business state: 'null', exception: 'URI of the local Platform Services Controller is not valid (Workflow:Configure Local Sites / Get SRM Urls (item1)#1)'

workflow: 'Configure Local Sites' (5dedb8cb-5f1f-415f-b534-c59e5f211aa2)

|  'attribute': name=SrmUrls type=Array/string value=__NULL__

|  'attribute': name=UrlError type=string value=

|  'attribute': name=errorCode type=string value=

|  'input': name=IgnoreWarnings type=boolean value=true

|  'no outputs'

*** End of execution stack.

Any ideas?

Thanks!