Use the below CURL to put Entities in Maintenance mode.
Time should be in UTC.
Use _key id for entities.
curl -k -u admin:password https://localhost:8089/servicesNS/nobody/SA-ITOA/maintenance_services_interface/maintenance_calendar -X POST -H "Content-Type:application/json" -d '{"title":"TEST MW","start_time":1589705600,"end_time":1589709600,"objects":[{"object_type":"entity","_key":"52f345bd-9764-4bc1-82a1-040"},{"object_type":"entity","_key":"45de7c5f-0d5f-4d50-9910-a1a"}]}'
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