HTTP 403 exception when browsing various options under vRealize Migration Assistant on vRA 8.4.1

After upgrading to vRealize Automation 8.4.1 , when you click on vRA Migration Assistant and browse to any of the options you would see below exception

Http failure response for https://eightfour.nukescloud.com/migration/api/business-groups?page=0&size=20&sort=name,asc&sort=tenantSourceName,asc: 403 OK

This issue is seen because of the recent changes performed with roles under version vRA 8.4.1

Previously in 8.3 or 8.4 GA, When we look into Cloud Assembly service roles we used to have roles as below

Service Role : Cloud Assembly
    1. Cloud Assembly Administrator
    2. Cloud Assembly User
    3. Cloud Assembly Viewer
    
Service Role:
    1. Migration Assist Administrator
    2. Migration Assist User

In 8.4.1 GA , we have following service roles

Service Role : Cloud Assembly
    1. Cloud Assembly Administrator
    2. Cloud Assembly User
    3. Cloud Assembly Viewer
    4. Migration Assistant Administrator
    5. Migration Assist Viewer
    
Service Role: vRA Migration Assistant
    1. Migration Assist Administrator
    2. Migration Assist User

See the difference here. From 8.4.1 vRA Migration Assistant service roles have been migrated to Cloud Assembly service roles

Keeping this scenario in mind, after upgrade we have following service roles assigned

1. SaltStack Config
2. Orchestrator
3. Service Broker
4. Cloud Assembly
5. Code Stream
6. vRA Migration Assistant 

Now to resolve this issue we need to select migration roles present under Cloud Assembly and ignore or remove vRA Migration Assistant

So now remove vRA Migration Assistant service role and select Cloud Assembly based Migration role as shown below

Post this , logout and login into the vRA Portal and you do not see the exception any more.