SendGrid does not support the TOTP standard (or any authenticator apps other than Authy), because as you mention, SendGrid and Authy are both owned by Twilio:

SendGrid does not support the TOTP standard (or any authenticator apps other than Authy), because as you mention, SendGrid and Authy are both owned by Twilio: https://docs.sendgrid.com/ui/account-and-settings/two-factor-authentication https://docs.sendgrid.com/ui/account-and-settings/two-factor... For anyone shopping for an email provider, this would be one reason to choose a provider other than SendGrid.