Error appears for 360 Monitoring in Plesk: Monitoring does not collect statistics for the server because it exceeds the license limit or marked as “Archived”

Symptoms

The following error appears in Plesk > Monitoring with 360 Monitoring activated:

Monitoring does not collect statistics for the server because it exceeds the license limit or marked as "Archived". To monitor the server, adjust your license limit or go to 360 Monitoring and unarchive the server.

Cause

Servers limit in the license is exceeded.

Resolution

Upgrade license servers limit or remove old/duplicates servers from 360 Monitoring.