This bug that Sims can’t move on after the second level has been fixed in Patch 1.97.42/1.73.
I like to plan a mountain climbing excursion but I can’t choose any team members as the check mark is missing.
I finished the first level of the mountain climbing excursion but I can’t move on from there.
It seems a bit hit and miss if the check mark is appearing or not. If the solution below doesn’t work, cancel the process and try again.
Close the window by clicking on x
Change to the screen to pick the location, go one level back or switch out the leader and back.
Go back to the selection for the team members. The check mark should now appear.