Google Optimize not picking up goal conversion on test page
I am running a Google Optimize A/B test on this page - https://www.isuzuutes.co.nz/book-a-test-drive/
Have installed all the Google Optimize code that is required according to the set-up section.
I know that the original and new test version of the page is showing as I have viewed them both on the live site.
The goal that I am tracking is the form completion - I have submitted a form on the original version on 1 PC and submitted the form test version on my phone.
The reporting shows the goal conversion on the original but not the test version as well.
Any ideas on what can be going wrong?