@hubcyclist Once a code is generated, it lasts forever, so no need to keep the app open. You can create a Group Workout now, get the code and then use it anytime in the future: tomorrow, next week, or next month. The workout will still be the same that you selected. You can even reuse codes.
For example: If I wanted to have a weekly Baxter ride with some friends- I can create the Group Workout now, and then reuse that code over and over each week without having to get a new code each week.