Local NPM dependency in package.json not installing

Hiya @Migs86 and welcome to the community! Sorry it took us a few days to get back to you.

Could you check out this debugging guide, and at a minimum, answer the questions at the end? being able to see your build logs will be step one for our troubleshooting, once you’ve confirmed that things work locally from a clean copy of the repo, and that you’ve got the same versions configured here as you use locally: