Unable to impersonate user about atlassian-connect-core HOT 2 CLOSED

$this->userClient = new JWTClient($team->tenant, null, $this->createUserClient($team->tenant));

    private function createUserClient(Tenant $tenant)
    {
        $user = auth()->user();
        if (!$user || !$user->jira_id) {
            return null;
        }

        // TODO: Reuse user token if exists and not expired
        // We can reuse the same token for 15 minutes

        // Generate exchange token
        $exchangeToken = JWT::encode([
            'iss' => 'urn:atlassian:connect:clientid:' . $tenant->oauth_client_token,
            'sub' => 'urn:atlassian:connect:useraccountid:' . $user->jira_id,
            'tnt' => $tenant->base_url,
            'aud' => 'https://oauth-2-authorization-server.services.atlassian.com',
            'iat' => time(),
            'exp' => time() + 30

        ], $tenant->shared_secret);

        // Exchange token for user token
        $authServerClient = new Client([
            'base_uri' => 'https://oauth-2-authorization-server.services.atlassian.com',
            'headers' => [
                'Accept' => 'application/json',
            ]
        ]);

        $res = $authServerClient->request('POST', 'oauth2/token', [
            'form_params' => [
                'assertion' => $exchangeToken,
                'grant_type' => 'urn:ietf:params:oauth:grant-type:jwt-bearer'
            ]
        ]);
        $access = json_decode($res->getBody(), true);

        //TODO: Store token

        // Use user token to act on behalf of user

        $stack = new \GuzzleHttp\HandlerStack();
        $stack->setHandler(new \GuzzleHttp\Handler\CurlHandler());

        $stack->push(\GuzzleHttp\Middleware::mapRequest(
            function (\Psr\Http\Message\RequestInterface $request)
            use ($access) {
                return new \GuzzleHttp\Psr7\Request(
                    $request->getMethod(),
                    $request->getUri(),
                    array_merge($request->getHeaders(), ['Authorization' => $access['token_type'] . ' ' . $access['access_token']]),
                    $request->getBody()
                );
            }));

        return new Client(['handler' => $stack]);
    }