A note regarding the AP Group and WLAN PUT APIs:
There is a two minute delay before committing changes made via PUT for WLANs and AP Groups. While these changes are pending they will only be visible to the API client that made the change and will not be visible in the UI. Two minutes after the last PUT the changes will be committed, become visible to all users, and also trigger Auto-Sync for applicable devices.
This two minute delay is in place to prevent scenarios of sending many configuration commands to devices in rapid succession since the API may be machine-driven.
An API to manually commit the changes immediately is on the roadmap.