Tabs and timeline trigger

I'm fairly new  to this so hoping this something simple that people can help with.

I have been asked to create a slide where a user must listen to the audio and also select the 3 tabs before they can move on.

I set this up using a template I found using tabs which works very well but I am finding that if you listen to the audio completely and then click through the tabs after the audio is finished then the Next button never appears so I am getting stuck.

If you click all the tabs before the audio ends it seems to work OK and I can't understand why. I suspect it's something to do with the trigger I set up but can't find any info on how to resolve this. Hoping an expert can help me identify what I am doing wrong.