Is it safe to make calls to Unreal gamelift plugin in multiple threads?

We are using the Gamelift Unreal Plugin.

Is it safe for us to make calls to the plugin api from different threads? For example:
Calling from a worker thread: FGameLiftServerSDKModule::StartMatchBackfill
Calling from the main game thread: FGameLiftServerSDKModule::StopBackfill



Sorry for the late reply, have pinged the GameLift team about this.