in the documentation at https://docs.onap.org/en/latest/guides/onap-operator/cloud_site/openstack/index.html in step 3 there is 

https://msb.api.discovery.simpledemo.onap.org:30283/api/multicloud/v1/MyCompanyName/ONAP_Cloud_Region_Name/registry

The problem is this will result in a search in AAI for 

https://aai.onap:8443/aai/v13/cloud-infrastructure/cloud-regions/cloud-region/MyCompanyName/ONAPCloudRegionName

the problem is in pub/msapi/extsys.py 

def split_vim_to_owner_region(vim_id):
split_vim = vim_id.split('_')
cloud_owner = split_vim[0]
cloud_region = "".join(split_vim[1:])
return cloud_owner, cloud_region

this is meant to just split of the first _ but it actually removes all the _ in the cloud_region as well.

I think it should be 

def split_vim_to_owner_region(vim_id):
split_vim = vim_id.split('_')
cloud_owner = split_vim[0]
#cloud_region = "".join(split_vim[1:])

cloud_region = vim_id.replace(cloud_owner+"_","")
return cloud_owner, cloud_region

Documentation at https://docs.onap.org/en/latest/guides/onap-operator/cloud_site/openstack/index.html should be updated to match this fix