when creating a union the error “Something went wrong. CSG returned error code -8.” (after that they write to contact the support service).
You should also provide the parts that cause this issue.
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Hey, I tried searching the error code and a staff member posted this as a solution in 2021 - not sure if this will be the solution still in 2023 but hopefully this can help:
Let me know if it works
Hi @videogameakt
Would you please share your place or model file so we can investigate the error?
Sorry for inconvenience
Hi @MrCattitude .Foolishly, I deleted the model (without saving it) 
(I apologize for my literacy, I am writing through a translator)
It’s probably because your model have too many triangles or the union is overloading.