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[v2] auth: don't send scope with application credentials - #3917
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Keystone returns 401 when a token request includes both application credentials and an explicit scope. Application credentials carry an implicit project scope already. For #3868
Co-authored-by: pýrus <[email protected]>
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stephenfin
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Aug 10, 2026
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Backport: #3869
Fixes #3868
When authenticating with application credentials,
ToTokenV3ScopeMapwas including a project scope in the token request. Keystone rejects this with HTTP 401:Application credentials cannot request a scope.Application credentials carry an implicit project scope already. The fix returns an empty scope map early when application credentials are present.
Links to OpenStack source confirming that scopes are rejected with application credentials:
https://opendev.org/openstack/keystone/src/branch/stable/2025.1/keystone/auth/plugins/application_credential.py