Search by custom user parameters

Hey everyone, quick question. I have a custom user attribute e.g. “memberId”, which is shown correctly on the User attributes at events,
But I cannot seem to be able to search for it as I would for any built-in user attribute such as:
user.ID:123-456
Is this a limitation? is there anything wrong with the implementation ?

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Bump! Would love a reply here as well. My team has accidentally saved user.uid instead of user.id and we’re unable to search using this “custom” field. Is there anyway to do so?