As for Rooted devices, you need to grant permission from Root permission management app.
There are 2 WAYS to grant root permission from the device:
Tips：after upgrading/re-installing , un-checked.
Go to AirDroid Business desktop client > select your Rooted online devices (with battery icon) > click on Remote Control.
Tips: If your Rooted devices is shown as Offline on AirDroid Business desktop client, please check if Biz Daemon is running on background AND check the internet connection of your Rooted devices.
To keep Biz Daemon running on background, you can refer to The Basic setup to improve the connection of devices