Federated identity providers push session tokens across jurisdictions faster than residency clauses can be enforced.
The first integration step maps every user directory into a single sign-on broker. That broker then caches refresh tokens in regions the original contract never listed.
Procurement teams sign data-residency addendums that list approved storage locations. The identity layer bypasses those lists the moment a partner IdP issues a cross-tenant assertion.
Release pipelines treat token validation as an infrastructure checkbox rather than a data-flow gate. No one reruns the residency scan after the broker adds a new regional endpoint.
Security reviews focus on authentication strength while ignoring where the resulting assertions actually land. The production environment therefore inherits token scopes that violate the original sovereignty commitments.
Finance sees only the reduced support tickets from unified login. The hidden cost appears later when regulators request an audit trail that no longer matches declared storage boundaries.
The pattern repeats whenever an acquisition or partner integration adds another identity source without re-mapping token lifetimes or assertion paths.