Lack of interest Searching for user's custom fields.

I have a required custom field where users put an ID related to another service while they can have any forum name they want. I'd like to be able to search for users with a certain custom field entry so I can find their forum account associated with their ID.
I just double checked. I can't search for someone's custom field even when I know they have it set to what I'm searching for. "No users matched the specified criteria."
This is how the custom field looks. I changed it to say ausername to prevent giving out too much info. (Same results with every kind of name/word I've tried.)
If I search for ausername, it says "No users matched the specified criteria."
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