Invalid authentication request

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Problem reference: 19091523-SIV6SLKV

Atacama platform activity:
LevelCategoryMessage
INFOcore >>>19091523-SIV6SLKV Invoking flow: authentication_response
ERRORsaml Don't support signed requests
WARNcore Action failed for provider 'SAML:receiveAuthNRequest' in 'authentication_response' flow. Returned status was: InvalidRequest
WARNcore Data-source 'Apache:request' failed to return any data for parameter 'OA_USER' with match: user
WARNsaml No available response
WARNsaml No available assertion consumer service URL
WARNcore Data-source 'Apache:request' failed to return any data for parameter 'prepend' with match: user
INFOcore <<<19091523-SIV6SLKV End flow: authentication_response