Could not decode access token response

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Harry M

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Jun 24, 2021, 12:15:18 AM6/24/21

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V13.0.1 Keycloak Server

Using PKCE for first time with an external OIDC IDP (unsure if it is related to PKCE or the IDP is not behaving as expected).

Below the log error generated subsequent to authentication on the external IDP -- suspect that the IDP is playing ball, however the logs are on vague side. Any potential tips w.r.t debugging further or what the cause of error could be? Thank you.

2021-06-23 16:29:44,447 ERROR [org.keycloak.broker.oidc.AbstractOAuth2IdentityProvider] (default task-43) Failed to make identity provider oauth callback: org.keycloak.broker.provider.IdentityBrokerException: Could not decode access token response.
at org.keycloak.ke...@13.0.1//org.keycloak.broker.oidc.OIDCIdentityProvider.getFederatedIdentity(OIDCIdentityProvider.java:364)

aused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: No content to map due to end-of-input
at [Source: (String)""; line: 1, column: 0]
at com.fasterxml.jackson...@2.12.1//com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)
at com.fasterxml.jackson...@2.12.1//com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:4688)

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