An ADOM has two device modes: normal and advanced. In normal mode, you cannot assign different FortiGate VDOMs to multiple FortiManager ADOMs. The FortiGate unit can only be added to a single ADOM.

In advanced mode, you can assign different VDOMs from the same FortiGate unit to multiple ADOMs.

To change to a different device mode, use the following command in the CLI:

Normal mode is the default. To change from advanced back to normal, you must ensure no FortiGate VDOMs are assigned to an ADOM.