So as of about 2 weeks ago, our NCM is showing the nodes (Switches, VGs, WLC, etc) that we download nightly configs from for backups as unmanaged or unknown. Because of this, NCM refuses to download their configs, but we're still able to ping, successfully test SNMP and validate login credentials.
Does anyone know how to change the device status? I've even attempted deleting and re-adding the nodes, but it's quite a long process to do for each individual one and doesn't really fix the issue as then it just shows as unknown.

Any advice?