are you using my page: https://economicstudio.github.io/scotauto/ or doing it yourself?

I've just tested with another account, and my enrollment page works well for me.

It may be possible that you're making another custom_json transaction at the same time.

Anyway, I've just also added SC authorization: https://api.steemconnect.com/authorize/scotauto Use this if keychain doesn't work.