I’m also having issues with emails not going through. I have WP Mail SMTP set up and test emails go through fine, but WP 2FA emails are not accepted (see error from WP Mail SMTP). Any tips on troubleshooting?
EMAIL DELIVERY ERROR: the plugin WP Mail SMTP v2.6.0 logged this error during the last time it tried to send an email:
Mailer: Other SMTP
SMTP Error: data not accepted.
Consider running an email test after fixing it.