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<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