interface selection with notification - error

interface selection with notification - error

hello together,

Version OPManager: 6016

during the email notification I cannot select the interface, the following error message appear:

No managed interfaces/ports found for this device.

the interface on the server can be selected however.
do I have to still activate the interface for the notification or which the problem could be?

the problem exists with all servers

thank you for the answer.

greets,
Rico