Not sure if it helps you, I was starting on a fresh project when i ran into this so I changed the naming convention and recreated the project with a slightly different name. I was able to enable it on the new project.TF seems flakey/buggy for enablin...

There seems to be someone else posting about this on reddit toohttps://www.reddit.com/r/googlecloud/comments/12nk0xp/compute_engine_stuck_in_deactivation/

I'm having the same issue. I've tried via terraform and the UI and am getting the same issue.I may have enabled and then disabled and now attempted to enable again (terraform woo) but I am now unable to enable it again.