Not able to send ~LoggedInUser.Id~ through HTPP Post

We’re trying to send ~LoggedInUser.Id~ through an HTPP Post after a note template is applied, it keeps defaulting to our default user. We put an email in front of the HTPP Post with the ~LoggedInUser.Id~ in the subject line, it works fine.

Any suggestions?

same problem here. Except that even in the email sent just before the http post, is also set at the default user. Does anyone have a solution?