Postman Pre-request script for Token

Question

I try to write Pre-script for auto-refresh for token before any request. I know about async, but for first two pm.sendRequest everything is okey, but last pm.sendRequest failed for some reason with error "unauthorised". But Activation token from jsonResponseActivationToken is on their place.

const newActivationRequest = {
    method: 'POST',
    url: newActivationUrl,
    body: {
    }
};

const activationTokenRequest = {
    method: 'POST',
    url: activationTokenUrl,
    body: {
    }
};

const sessionTokenRequest = {
    method: 'POST',
    url: sessionTokenUrl,
    body: {
    }
};

pm.sendRequest(newActivationRequest, (err, responseNewActivation) => {
    const jsonResponseNewActivation = responseNewActivation.json();
    const statusNewActivation = jsonResponseNewActivation.status;
    
    if(statusNewActivation === 'SUCCESS'){
        pm.sendRequest(activationTokenRequest, (err, responseActivationToken) => {
            const jsonResponseActivationToken = responseActivationToken.json();
            const statusTokenRequest = jsonResponseActivationToken.status;

            if(statusTokenRequest === 'SUCCESS'){
                const newAccessToken = jsonResponseActivationToken.access_token;
                pm.collectionVariables.set('token', newAccessToken);

                pm.sendRequest(sessionTokenRequest, (err, responseSessionToken) => {
                    const jsonResponseSessionToken = responseSessionToken.json();
                    const statusSessionToken = jsonResponseSessionToken.status;

                    console.log('8');

                    if(statusSessionToken === 'SUCCESS'){
                        const newSessionToken = jsonResponseSessionToken.access_token;
                        pm.collectionVariables.set('token', newSessionToken);
                    }

                });
            
            }

        });
    }
});