WP admin user search doesn’t return all users

I don’t believe you are doing anything wrong, I think it is the way the get_users function works https://codex.wordpress.org/Function_Reference/get_users

search – Use this argument to search users by email address, URL, ID, username or display_name.

Perhaps the phrases you are searching with do not match any of the above as it needs to be a full match unless you use the * wildcard which you can add before, after your search string (or both).

From the above codex link the codex link…

You can also do wild card search by adding an * before or after your search query. For example, to search for all users that start with “jo”, you would pass something like “jo*”.

The results will be all users whose user names, IDs, or emails that start with “jo”. The * can be placed before or after your search query. When placed before, the results will be all users that end in your query.

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