A specific projection's REST API documentation/endpoint is inaccessible under the Compatibility Application Type used for integrations ("Int"), returning a login prompt that doesn't accept any valid credentials, even though the same projection works fine under the default ("Main") application type and SSO/login itself works elsewhere.

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Answer

Before troubleshooting SSO or authentication further, check whether that specific projection has simply had its "Int" Compatibility Application Type deliberately disabled, leaving only "Main" enabled — a developer can intentionally restrict a projection to a single application type, and this produces a login-prompt-that-never-accepts-anything symptom that looks exactly like an SSO/authentication problem but is actually the application-type restriction working as designed; check the projection's Compatibility Application Type settings before assuming it's an SSO configuration issue.

Documentation-based answer. Confirm the product and release before applying it. This answer has not been verified in an IFS environment.

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