Hi, @Boopathi S
Thank you for posting in Microsoft Q&A forum.
Have we tried to run CCMRepair or reinstall the client agent on one of the 30 devices?
The message in ClientIDManagerStartup.log is normal, is there any other error message in ClientIDManagerStartup.log?
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After the way you tag questions on Q&A is updated, for any "Microsoft Configuration Manager" related problem, you can tag it with "Microsoft Intune", and then "Microsoft Configuration Manager" as the child tag.