Unable to return the Next button to NORMAL from DISABLED

Hello Articulate Gurus,

I know this is a fairly simple ask but I am really stumped here. I have a slide with 4 tabs and each tab navigates to a different layer. The ask is to implement restricted learning wherein the user can click on any tab in whatsoever order. The Next button, which is a custom button, enables only when all 4 tabs are visited in whatsoever order. I tried to achieve in two ways:

• Used a number variable and applied trigger on each tab and set their respective values when other three tabs are "Visited"
• Used a fairly simple way where in first I changed the state of next button to disabled when timeline starts and changed it to normal when all 4 tabs are "Visited"

None of the aforementioned methods gave me the desired result. The irony is when I implemented first method on a slide with 3 tabs, it worked like a charm but its just not happening on the slide with 4 tabs.

I attached both story files. Please see what am I doing wrong and if you could kindly guide me to the right direction. I'd be more than thankful.

Thank You,

- Shiva