Pricing sync is a sub-feature of the property Sync tool, which means it will only be activated when you have Sync enabled.
Before enabling price sync, please make sure you have Smart Pricing turned off in Airbnb.
To enable Sync:
Go to Properties
Click on the individual property page
Click on the toggle button for Sync (it will turn green to indicate it's on, grey when it's off).
To activate Pricing Sync:
Click on Settings
Click on Sync
Click on the toggle button for Pricing sync (it will turn green to indicate it's on, grey when it's off).
Click Save changes