AddTriggerEffect Not Working

[Cwarren2025]

I am having issues with using VBA to make an audio track start on another's bookmark. I have tried looking into AddTriggerEffect and msoAnimTriggerOnMediaBookmark, but none of my research is working.

I have looked at these sites and more:

https://www.skphub.com/2010/ppt002.htm
http://skp.mvps.org/2010/ppt002.htm
https://learn.microsoft.com/th-th/office/vba/api/powerpoint.msoanimeffect
https://learn.microsoft.com/en-us/office/vba/api/powerpoint.sequence.addtriggereffect
My most common issue is "Method or data member not found" in response to: .TimeLine.InteractiveSequences.Add.AddTriggerEffect

At this point, I can figure out how to customize my animations in every way, except for making one run through a bookmark via vba. Please lmk if you have ay further questions.

AddTriggerEffect may not work anymore.