How to fetch ALL users related to a field, including unverified/pending?
The correct syntax or finding all users regardless of status is status(null), which you've tried, but the issue isn't your status parameter, it's the targetElement parameter of your relatedTo query.

It only accepts the actual element you're looking to query, not its ID.

If you already have the target element object, you can just pass that in. If you don't, you can retrieve it with:

$targetElement = Craft::$app-&gt;getElements()-&gt;getElementById($organizationId);


Then use:

array(
    'targetElement' =&gt; $targetElement, 
    'field'         =&gt; 'organisation'
)


Relevant docs here: https://docs.craftcms.com/v3/relations.html#the-relatedto-parameter