MS Graph signin activity is not working as expected

Anil Chintalapudi 1 Reputation point
2021-04-21T08:10:49.637+00:00

I have ran the filter query as below:

https://graph.microsoft.com/beta/users?$select=displayName,signInActivity,mail,externalUserState&$filter=signInActivity/lastSignInDateTime le 2021-04-20T00:00:00Z

its has provided the report with lastSignInDateTime but in report for some active users doesn't have last signin information and users with signin info doesn't have other columns info as attached in screenshot:
89817-image.png

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