The device belongs to IP Domain Global Collection (Default Domain) in Spectrum. The "Perform a Full Resynchronization" was already done on the Spectrum Data Sources.
DX NetOps Spectrum and PM (Performance Management) integration
Spectrum CAPC_Item_Id (0x13214) attribute ID value and PM Item ID value mismatch.
1. Removed the device in question from Spectrum IP Domain (Default Domain) GC.
2. Run "Perform a Full Resynchronization" against Spectrum Data Sources in Portal.
3. Added the device in question back to Spectrum IP Domain (Default Domain) GC.
4. Run "Perform a Full Resynchronization" against Spectrum Data Sources in Portal.