what I am trying to do is to assign the Primary Contact for the Autotask Account to tickets where Super Magic cannot determine the account from the details int eh thread. I get these errors.

Unfortunately, the "Is Primary" contact flag in AutoTask isn't something I can query through the available tools — that field lives in AutoTask's contact records but isn't exposed via the API I have access to.

I can see all 50 contacts but none are flagged as "primary" through the API — that flag only exists in AutoTask's UI.