Auth 2.0 Error 400 on Mail account

I try to add my account but I got this message


Authorisation Error
Error 400: invalid_request

You can't sign in to this app because it doesn't comply with Google's OAuth 2.0 policy for keeping apps secure.

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redirect_uri: urn:ietf:wg:oauth:2.0:oob



What's wrong with Apple and Google? Google asks to contact the developer, yes Apple...


It's so frustrating...

Posted on Feb 22, 2023 2:58 AM

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Question marked as Top-ranking reply

Posted on Mar 9, 2023 9:12 PM

I FOUND THE SOLUTION.


People have mentioned it here, but with incomplete steps. So here is how to get it done:


1.) KNOW why this is happening in the first place: it's coz Google says your old mac and old mac OS have insufficient security. With that said, you can only update an old mac for about 7-10 years. Then you're SOL. Keep that in mind. Lucky for us old mac users (I'm running a 2011 MBPro with ElCapitan) -- we are still able to add new GMAIL accounts with a workaround.


2.) As mentioned here, open your GMAIL account preferences by signing into GMAIL by web browser and clicking on your avatar in the upper-right and selecting "Manage your Google Account". Then click on the "Security" tab on the left.


3.) Under "Signing in to Google" ENABLE 2-step verification. This alone will NOT fix it, but it WILL allow you use what Google calls "Less Secure Apps Access". If you notice in your account settings, Google automatically sets this to OFF -- essentially blocking access to any apps that Google dubs 'insufficient security'. Enabling 2-step verification will bring up a third line under "Signing in to Google" that says "App Passwords".


4.) Click on "App Passwords" and this will walk you through generating a password that you can use to manually add a GMAIL account with your old mac.


5.) Select and copy the generated password, go into Apple Mail preferences and select "other" when adding the new email account. Type in your gmail email address, and use the password you copied earlier, in the password field.


If this helps, PLEASE hit the kudos button to bring it to the top!

218 replies

Jul 3, 2023 1:16 PM in response to AlexandraKorolev

Yo lo hice así, *** doble factor es mas seguro que salga bien. Sobre todo es engorroso por las notificaciones, móvil, y ordenador juntos para los mensajes de texto si es necesario.


  • Ahora pasa que no me sale Contraseñas de aplicaciones, ha cambiado.


Entrar en Chrome

  1. Preferencias
  2. Privacidad y seguridad
  3. Seguridad
  4. Contraseñas de aplicaciones
  5. Seleccionar app (correo)
  6. Seleccionar dispositivo (mac)
  7. Generar código
  8. Copiar código y guardarlo


Luego regrese a las preferencias del sistema y las cuentas de Internet.

Eliges Añadir " OTRA CUENTA

ingrese los detalles *** la contraseña copiada

Feb 22, 2023 7:10 AM in response to ays177

I understand you want to add a Google account to the Mail app. To do that follow these instructions from the Mail User Guide: Add email accounts in Mail on Mac - Apple Support. Select your macOS version from the dropdown menu at the top of that page. To find out the macOS version your Mac is using please read Find out which macOS your Mac is using - Apple Support.


If you continue to get the error then contact Google for assistance: Contact a third-party vendor - Apple Support.

Feb 22, 2023 7:17 AM in response to ays177

To add to previous posting


Link below outlines some changes in Google regarding using Non Native Android Apps to access Google e-mail Services


The Application Specific Password factor was introduced not only in Google e-mail but also similar in Apple


Sign in to apps with your Apple ID using app-specific passwords - Apple Support


https://support.google.com/mail/answer/185833?hl=en-GB


Jun 4, 2023 11:06 PM in response to ays177

  • Generate app specific password on google
  • System Preferences -> Internet Accounts -> Add CalDAV account
  • Set account type to Advanced
  • Set user name to google account (yourusername@gmail.com)
  • Set password to app specific password previously generated
  • Set server address to: https://calendar.google.com
  • Set server path to: /calendar/dav/yourusername@gmail.com/user/
  • Set port to: 443
  • Put a checkmark in: Use SSL
  • Leave "Use Kerberos" unchecked


Sign in

Mar 12, 2023 10:24 AM in response to igor-dB

I’m sorry I can’t help much there as I only use my iCloud account with Apple Notes and Calendar — and this is exactly the reason for that.


Your best bet would be to use a Google-compatible alternative to Apple Notes and Calendar, on your system. I can understand how this is NOT ideal — but at the same time, Google has been firm with their decision to no longer support this on older systems.


Looking at Google’s REASON for doing so is palpable: the older systems/apps just don’t meet their security requirements. Now, a new app may be designed to work on older systems, and may be designed with updated security protocols — and such an app would be what you are looking for.

Mar 22, 2023 11:44 AM in response to ays177

This all happened to me when I was trying to find the solution on why my gmail was not syncing with my iPhone and Mac Mail. Solutions offered in the apple community forum suggested deleting gmail from both Mac mail apps on phone and computer and then re-installing them. When I did that and tried to reinstall my gmail account in my Mac mail, I got this error, and I am so irritated. While the solution from user "The Animaster" below worked somewhat, I have lost the ability to have my gmail calendar on my ical now, and it still doesn't sync. My gmail is my work email address so obviously this is a major inconvenience especially with the calendar.


Is anyone from apple monitoring this problem? Can any apple representative reading this particular forum chain make any sort of suggestion? My iOS is not old, and my laptop isn't a spring chicken but its not old either - I am operating on iOS High Sierra 10.13.6, on a 2017 MacBook.


Honestly, for what we pay for these machines and all the software, we shouldn't be crippled so easily to function if anything is over 3 years old. Updating the iOS is not a convenient solution as I know it will slow down my computer and some of my paid software will not work properly. And I am unfortunately not a Rockefellar where I can just dish out $2k every 3 to 4 years for new computers.

Mar 23, 2023 7:25 AM in response to igor-dB

Noticed that my most recent post was removed. Deleted what I presume was the problem and will try again.

++++++

The facts are that if you are using Apple hardware and software any older than the last few editions they flatly don’t care if you have problems or not. The equipment may be built like a tank and last forever, but only if YOU can keep it running. They will not help, as you will find if you ever contact their customer support with issues with older hardware. They will give you the brush-off as quickly as they can.


Fortunately for those of us running old stuff, there are those users with advanced skills who are dedicated to getting it to work (though you won’t find many of them here). With their help my MacPro 1,1 (2006) is still able to run El Capitan, and while Safari has occasional problems on it, Firefox and Chrome work fine and MacMail still works with Gmail, thanks to Google’s app password methods outlined by The Animaster above. Good luck.

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Auth 2.0 Error 400 on Mail account

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