In Javascript, using the POST API call postUsersSearch(body), if multiple pages are available a q64 value is returned (nextPage).
If you call the GET API getUsersSearch(q64 string, options) and pass the q64 value, the expected results are returned.
However, if you try to pass an object with an array of several expand values. None of the expand values are returned. I've tested this in JS, the original API Explorer and the new Dev Center.
It appears the API is taking the array of expand values and ignoring them. In the API Explorer, it concatenates the list as a single entry. ie expand=presence,routingStatus.
The correct syntax appears to be: expand=presence&expand=routingstatus.
Using v163.0.0 of the JS library