contoso.com, select contoso.com from the list. This configuration is used to set up the federation relationship between AD ...

@contoso.com, select contoso.com from the list. This configuration is used to set up the federation relationship between AD FS and %BRAND_AZURE_ACTIVE_DIRECTORY%. It configures AD FS to issue security tokens to %BRAND_AZURE_ACTIVE_DIRECTORY% and configures %BRAND_AZURE_ACTIVE_DIRECTORY% to trust the tokens from this specific AD FS instance.