To learn more I messed about with this today.
Raced
While results still showed green bolts I changed ride CA Activity to private.
ZP system soon updated almost all racers to blue bolt.
Mine was still green and no activity info in ZwiftPower.
Changed CA Activity to Public.
Waited for system to update itself and bolt has turned blue and activity now shows in ZwiftPower.
You might need to request an update.
Link below from another similar thread.