4-Axis machining with Mach3 on Chinese 3040 Mill

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I have been using my Chinese 3040 3-axis mill for over a year now with Fusion360 to successfully make numerous parts. I have now just become confident and adventurous enough with my machine to start learning to use the 4th axis that came with it.
I thought a simple .step model of a M8 Partially threaded Hex bolt from McMaster-Carr would be a good place to learn making 4-axis CAM operations. I however cannot get anything to get any operations to work. They all give a Internal CAM kernel error: Boundary is not closed.
I have tried watching videos and reading forum posts about 4-axis milling and things are just not working the same for me. I don't know if its because of the threads or the way it was drawn/imported.
I am sure i have something wrong but i don't know at what point i started to make mistakes. Since i am just learning and using this part as an example it may be better is someone could show me how to properly create the setup and CAM operations this part. This is what i was hoping to accomplish
model: https://www.mcmaster.com/#95327a562/
I have XYZ B Axis movement - true 4 axis, not 3+1
Stock is rectangular X20 Y40 Z20
1st op would bring the square stock down to a cylinder
2nd op would cut flats on the hex
3rd op would cut the threads
Thanks in advance for any help.