Thank you! This did the trick!

Thank you! I was able to accomplish it (possibly) more simply by adding a Search module to find the right Task ID, and then a Update Record to mark it complete.

Hello! I'm building a Fusion scenario in which there's a trigger field in a custom form attached to a project. Once that trigger gets flipped (and a number of other Fusion actions take place), I'd like Fusion to mark a specific task from the project as complete.    Where I'm running into trouble is ...