Partial update. subjectId and subjectType are immutable from the caller's perspective; subjectId is set by the server when an unresolved natural-human Stakeholder resolves. Principal authority is transferred only through POST /platform/accounts/{accountId}/transfer-principal. Setting roleId, roleIds or scopes on an Account-typed Stakeholder returns 422 ValidationError.
Unresolved email updates, Principal controller defaults, and subject-bearing accountSuppliedComplianceEntityId updates are backed by the users service.
Requires a session with recent MFA step-up for StakeholderChange. If step-up is missing or expired, this operation returns 403 StepUpMfaRequired; create and verify an MFA challenge at /v3/platform/mfa-challenges with requiredFor: "StakeholderChange", then retry.
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