In the past, I had no problems at all starting a new sensor via the iPhone app, and then following the Tandem’s instructions to “skip” a code entry to join an already started session.
After the Control IQ update, this hasn’t worked reliably - either a problem with the sensor believing it has been started twice (and refusing to start) or the session is started in manual mode requiring every 12 hour bg calibrations.
I’ve had two subtlety different answers on the right order to do things. Last time, I was told to stop the phone session, stop the pump session, start the phone session, and then join the started session via skip on the pump. This evening I was told to stop the pump session, start the session on the pump (and enter the code), and let the phone sync without any intervention.
Anyway, seems like there should be a write-up on this somewhere, but I can’t find anything.