How to deal with Microsoft disabling Basic authentication

bookmanjb wrote:

"After Basic authentication is disabled for your organization, Apple Mail may prompt you to re-enter your Microsoft 365 email password, which will switch your device to modern authentication automatically. Your computer must be using macOS version 10.14 or later."

Basically it means you have to upgrade macOS to Mojave 10.14 or later. You need a 2012 or later Mac to do so.

Thanks for your post! :)

What may work for earlier...

Using app passwords with apps that don't support two-step verification (microsoft.com)

What about application passwords? Will that keep working?

If application passwords are being used for MFA (Multi Factor Authentication) along with basic auth as another auth mechanism, then when basic authentication is disabled, app passwords used for MFA will stop working too.

Where can I find more information?

There are several resources that we wanted to provide here as additional reading:

• Basic Authentication Deprecation in Exchange Online – September 2022 Update – this is a comprehensive post containing more information about this effort.
• Deprecation of Basic authentication in Exchange Online – our official documentation related to this effort, with links to much more information and guidance.

https://techcommunity.microsoft.com/t5/exchange-team-blog/exchange-online-email-applications-stopped-signing-in-or-keep/ba-p/3641943

Exchange Online email applications stopped signing in, or keep asking for passwords? Start here. - Microsoft Community Hub

They will probably be limited to using web mail.

You may be able to find a 3rd party mail client that supports modern authentication, but I haven't run across one that will run on High Sierra yet.

Who is your email provider? It's not clear what Microsoft has to do with anything unless you're using an email account hosted by Microsoft 365, either business or personal.

You would have to ask Microsoft about that.