I am populating a dropdown in Powerapps with JobTitle Assistant Director. I have around 2300 users. I am able to successfully retrieve some users whose JobTitle is Assistant Director from the top:999 by using the below query.
This will look in all the records while Top:999 was restricting the first 999 records from the Office365 connection. You can remove searchTerm if that is not required.
Hope this Helps!
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The reason why you met this problem is that 999 is Office365Users.SearchUser function's limit, not delegation problem.
Changing delegateable limit is useless.
The 999 is the maximum value of user records retrieved from Office365Users.SearchUser() function at once. The user @JonFrost has faced same issue with you, please check the response from Microsoft Employee @dinusc within the following thread: