New Yahoo accounts may be unable to create App Passwords to use with Nylas.
Attempting to create an App Password in the Yahoo web client will produce an error stating "Something went wrong, try again later!"
Please reach out to Yahoo for assistance. Nylas does not support Yahoo's OAuth process so we need an App Password to work with Yahoo accounts that have 2FA/MFA enabled.
Some users have reported success generating an App Password from Yahoo mobile apps.