Delegates endpoint call to be invoked on the list of provided child Tenants

Allows you to perform multiple RESTful calls at once on behalf of your child Tenants' while still using your own credentials.
Your currently signed-in TenantUser's permissions will be used in the proxied calls. Hence if your permissions are insufficient
to make the same call on your main Tenant account, trying to make the same call on behalf of your child Tenant(s) will result in
a 403 HTTP response code.