In case webhooks do not properly work, manually trigger the sync for an individual iteration allow users to pull in the latest status out of the ALM-tool into an individual iteration on the team board.
Note: The status in your ALM-tool is always master
How to re-sync an iteration
In the piplanning app: go to the team-board you want to sync
In the iteration of your choice, you find the iteration-menu on the top right (3 vertical dots), select "Synchronize Iteration", and confirm the popup.
Consider the following situation: If a work item moved to another iteration (from iteration A to iteration B) in the ALM tool, and you sync iteration A in the app, the corresponding sticky will get removed from that iteration in the app. To make the sticky appear again in the app, you will need to manually sync iteration B as well. (You could also sync iteration B in the first place => will move the sticky from iteration A to iteration B in the app)