Transaction for 3rd party auth process

[edwardyoon2]

I expected that I can track a transaction for 3rd party social login like below:

const currentTransaction = apm.getCurrentTransaction();
const redirectUrl = `${authUrl}?elasticTxId=${currentTransaction.id}`;

// 3rd party callback redirects
const txId = urlParams.get('elasticTxId');
apm.startTransaction('auth-callback', 'auth', {
  childOf: txId
});

But, it seems impossible to maintain transaction state across cross-domain redirects.
Is there some reason about this?