| Description | This article describes the reason why the interfaces are not in use but cannot be added to a different VDOM. | 
| Scope | FortiGate. | 
| Solution | In this case, port 5 is not in use but when trying to assign to another VDOM, the error can be seen. 
 This happens due to the interface is being referenced in other settings. To check the reference of the interface, refer to the following articles: After all of the references are removed, the interface will be able to move to different VDOMs. | 
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