You’ll need to add a STEX account in your authenticator app and either manually enter the 16-digit recovery key.
Manually enter the 16 digit key
Scan barcode using app
You may now continue using your Authenticator for logging into STEX.
IMPORTANT: Backup your recovery key!
Backup your 16 digit key/ barcode and put it in a safe place. If your phone gets lost, stolen, or erased, you will need this key to get back into your STEX account! Without this key, the only way to regain access will be filling a form to disable 2FA and can be a lengthy process.