PCA 10.5 automatic transfer logs on to host PCA but not to domain

[ni...@acu.org]

I am trying to set up an Automatic Transfer from a client to my server
at scheduled times. Task scheduler launches PCA correctly and it logs
onto the server's instance of PCA, it also ctrl+alt+del the server to
open the login dialog box, but then it doesn't supply the username and
password. If I leave the server logged on, the Automatic File transfer
takes place without a problem.

How could I get PCA to log onto the domain after logging onto PCA? I
am using PCA authentication.