Hey @DrEvil75, welcome to the forum 
it looks like your intent examples have spaces in the entity annotations. This prevents any entity extractor in your NLU pipeline (DIETClassifier or RegexEntityExtractor) to learn to extract the entity. Try to remove the spaces, like this:
that is [1234567890] (trackingid) -> that is [1234567890](trackingid)
In my case, everything works when I delete the spaces. Let me know how it goes for you.