A couple things to check:

Make sure that you have opened the state at least once and saved since marking the CA return for electronic filing.

When in the EF Center, be sure that you are on the All or Pending tab. You will not see a return that has not been Accepted on the Accepted tab.

If you still don't see it. Go back into the return and uncheck it for efile. Go to the state and save and then close the return. Go back into the return and remark for efile, go to the state check for errors and save and then check the EF Center again.