There is no out‑of‑the‑box functionality in IIQ 8.4 to enforce password uniqueness across environments for the same application.
I would try this solution:
Implementing a Before Password Change / Reset Rule in “LCM Manage Password workflow”.
Useful links: https://uploads.teachablecdn.com/attachments/CnaCoGdxR9K8wcM3ixBQ_Rules_in_IdentityIQ_7.2.pdf
This rule can:
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Access the new password in clear text
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Iterate over the user’s linked accounts (APP_DEV / TEST / UAT / PROD)
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Compare against existing passwords (via target/system validation)
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Reject the request with a custom error message if a match is found
Standard password policies work per application only and cannot do cross‑environment checks.