Power BI Data source connection to Defender for Vulnerability management via multitenant gathering

I am trying to fetch data from multiple tenants that i have a guest access to, but can only get data from my own tenant. 

Few question here:

1- Would the client tenant (which i am a guest account in their Entra ID) wanting to gather data from defender for vulnerability management, what steps i need to do so? (Ex: Would the client tenant need to register defender app in Entra ID and add permissions like these?

2- Does the client tenant need to configure "multi-tenant organisational access like this one? Or it isn't necessary?

Thanks