In my case it was generating the mesh very far away from the 0,0,0 point. Was not aware of where the reference point of the mesh was. 

I run into the same issue when trying to create a mesh in GH and send it to AC 27. It is being shown in Rhino/grasshopper but apparently the geometry does not get sent over to AC. any fix for this?

wenn einfach kopieren nicht funktioniert, dann musst du anstelle von dein Windows username benutzen: C:\Users\\AppData\Roaming\Graphisoft\Archicad 27.0.0 GER R1\OnlineHostedTemplates\