I have for years used Gmail as my email client for my Microsoft365 Outlook email for work. This includes using the Send Mail As feature in Gmail. My company had to do a security upgrade and enable multifactor authentication. Since we've done so, I am unable to use the Send Mail As feature -- I get an error message: Server returned error: "Missed upload deadline (state SENT_SECOND_EHLO), code: 421".
It was suggested that I get an App Password through Microsoft365 and use that to establish the connection to Gmail. I tried to follow the steps to this article: https://support.microsoft.com/en-us/account-billing/manage-app-passwords-for-two-step-verification-d6dc8c6d-4bf7-4851-ad95-6d07799387e9
I got to my account, and to Security Info, clicked Update Info, and clicked Add Sign In Method. The instructions say I should select "App password" from the dropdown menu as a new sign in method. However, that option isn't there! My only options are Authenticator App, Alternate phone, and Office phone.
We are a small shop with only an IT consultant who is out of his depth on this issue. I also have access to the Microsoft 365 Admin Center. Is there a way to configure out multifactor authentication settings that makes the generation of an App Password by a non-admin user possible?