Thanks for the question. This should be possible. However, I tested printig html customer letter and client crashed. So this seems to be a bug. I will report it and push it to the development team.
are the activity set as Hansamanuals said?
https://www.hansamanuals.com/main/mailnumber___62526/theconf___231/manuals/version___20250224/langcode___es/hwconvindex.htm?shortcode=HW0301SETTINGS_Order...
SendWebRequest3 is a boolean function, so if this returns true and the reply header has an accepted status, you can assume that the data was sent successfully and perform some actions on the record th...