After installing VCD 9.1 its observed the HTML5 tenant portal is blank. The legacy Flex based tenant portal is fine. 
The reason for the blank screen is missing ‘Tenant‘ in Tenant Portal URL syntax. The issue resolved after adding tenant as suffix.
After installing VCD 9.1 its observed the HTML5 tenant portal is blank. The legacy Flex based tenant portal is fine. The reason for the blank screen is missing ‘Tenant‘ in Tenant Portal URL syntax. The issue resolved after adding tenant as suffix.