For someone to help authorize a tithing batch, he must:
1) Have a membership record or out-of-unit membership record in the ward.
2) Have an applicable calling recorded (this is done on Leader and Clerk Resources): bishop, bishopric first counselor, bishopric second counselor, ward clerk, ward assistant clerk, or ward assistant clerk—finance (not ward assistant clerk—membership). This must be a standard calling and not a custom calling (make sure there's not an asterisk to the left of the calling name in Leader and Clerk Resources).
3) Have an MLS user account created: member of unit, tied to their membership record or out-of-unit membership record, and finance checked.
If he is not able to help authorize a batch, chances are that step 2 or 3 were done incorrectly or incompletely.
If step 2 or 3 were done but it still doesn't work, you could try to send and receive changes, log out and back in (the tithing batch will save), or, as a last effort before calling support, request a unit data refresh and follow it up with some send and receive changes.
Samuel Bradshaw • If you desire to serve God, you are called to the work.