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I will need some more information about your issue.
Could you please give a sample of what you've been doing and what api calls gave you 401 ?
Not getting output from Zero Footprint Synchronous Screening: Simple API when passing Secondary field
Is it possible to screen individual and organisation in a single request using ZFS? What if I specify the entityType as UNSPECIFIED
ScreeningRequest in Postman ZFS environment returns 401 Unauthorized
Why are my credentials not working?
Load list of person in WCO