Sophos API pagination

Here is my complete code if that would help. It returns only 50 users! HOW DO I GET IT TO RETURN ALL USERS?

$userAPI = "">api-us03.central.sophos.com/.../users"
$USAUserList = @()

do {
# Send a GET request to the API to retrieve a list of users
$GetUsers = Invoke-RestMethod -Method Get -Uri $userAPI -Headers $USAheaders

# Add the retrieved users to the array
$USAUserList += $GetUsers.items

# Check if there are more users to retrieve
if ($GetUsers.next -ne $null) {
$userAPI = $GetUsers.next
} else {
$NextKey = $null
}
} while ($GetUsers.next -ne $null)

I guess you've already solved it by now, but if the API you are referring to is this one https://developer.sophos.com/docs/common-v1/1/routes/directory/users/get then it doesn't use the "next" method. It uses page numbering - pageTotal=true to get the page count on the first call then count pages thereafter.

I wrote a "InvokeRestMethodAllPages" helper for my scripts that detects based on what is returned if it uses next or page counts so I never need to worry about which I'm calling :)