Android Question Sending emails with Gmail REST API from another Activity causes a refresh token problem

Erel said:

The first token parameter in GoogleOauth2 sets the target module. This is the module that will receive all events. If you want to use it from multiple activities then add a service (or use the Starter service) and from the service delegate the event to whichever activity you like.

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The tutorial demo in the thread referenced above works perfectly for me as is. However, I want to handle emailing from a different activity called Email, so I've set the first parameter in GoogleOAuth2 to Email and moved subroutine Send to the Email activity. I can send emails fine after the first install, while the authentication token is valid. However, if I compile again a while later, after the token has expired, I get these log messages:
This doesn't happen if Sub Send is in Main instead of Email. It seems that an event is being raised by GoogleOAuth2 in Main, instead of in Email, where I would expect it to be because I set Email as the target. Does anyone have any input on this?