Issues with being able to RDP into systems with accounts that have not been shared to you.

We have 3 domains and with an administrator account logged in when we attempt to RDP to systems with OTHER DOMAIN ACCOUNTS we get the drop-down to pick the domain name, account name, reason, etc. As expected as an Admin account we have access to all the users/passwords so they all show up.

However now we have normal user accounts for PMP. They have a single account shared out to them in a single domain, yet when they go to the Login with Other Domain Accounts they get the drop-downs for all 3 domains and all the accounts in each of those domains. Why are they seeing everything instead of only the 1 single account they have had shared out to them?

Thanks,

-Ryan