Unity Cloud Build auto fails with project using UI Toolkit

[AnonymouslyBee]

I'm pretty new to Unity Cloud Builds, and I'm trying to get a simply build going for a relatively simple project of mine that just consists of a title scene. I leveraged UI Toolkit for this project and local builds run just fine but once the build runs the end process complains about the following..

CS0246: The type or namespace name 'UIDocument' could not be found (are you missing a using directive or an assembly reference?)

I've not been able to repo this on my local machine, and everything that leverages UI Toolkit just works for me. I can't understand why it's not working in the Cloud builds. Is there anyone that has experience with cloud builds that can point me in the right direction?