After an environment migration to new servers without a software upgrade, the Secure Domain Manager area of the OneClick Navigation panel is missing.
All supported DX NetOps Performance Management releases
Had not yet copied over the $SPECROOT/SDM/sdm.config from source to destination systems when migrating the primary server.
Copy the $SPECROOT/SDM/sdm.config from source to destination. Make any necessary config changes and save the changes to the file. Stop and restart the SpectroSERVER.
After some time passes for OneClick to catch up the Secure Domain Manager option in the OneClick Navigation pane should reappear.