• Wrong token or expired token :

Solution : Repeat the OAuth2.0 Authentication process and update the token.

• Wrong JWT or expired JWT :

In the header response : WWW-Authenticate :
Bearer error="invalid_token", error_description="An error occurred while attempting to decode the Jwt", error_uri=https://tools.ietf.org/html/rfc6750#section-3.1
Solution : Repeat the JWT obtention process and if, necessary, the OAuth2.0 Authentication process to update the tokens

• Repository service down

<OperationOutcome xmlns="http://hl7.org/fhir">
    <issue>
        <severity value="error"/>
        <code value="not-found"/>
        <details>
            <coding>
                <code value="Resource could not be found"/>
            </coding>
        </details>
        <diagnostics value="not found"/>
    </issue>
</OperationOutcome>

Solution : Renew your access token. Repeat the JWT obtention process and if, necessary, the OAuth2.0 Authentication process to update the tokens