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 Best 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!

214 replies

Feb 23, 2023 1:27 PM in response to ays177

Then put and .. . . and vent to the E-mail Severs of the Users' Choice.


We hear similar complaints directed towards Apple for imposing things on Users in the iOS / macOS they do not like.


Don't like Google, Don't Apple.


Maybe some other platform would be a better fit.


Has the user tried Linux - Oh don't them either 😔

Feb 23, 2023 2:12 PM in response to PRP_53

funny thing is with my Raspberry Pi Zero2 which is 15 pounds I can use all and have better performance than on this Mac with newer OS... I remember when internet was useful and usable, now thank you to giant techs here we go. I have also Issues with email from outlook 365... Thunderbird works great for gmail, you need to use an older version but works... it's crazy Google makes trouble for Apple and Apple can't do anything about it

Feb 23, 2023 2:27 PM in response to ays177

We all like our Soap Box from time to time


You are welcome for the free technical advise as it relates to Apple Computers, Service and Software.


There has been sufficient advise offered, from more than one Contributor, for the User ( you ) to make an informed and educated choice what the next course of action is required for this computer.


The suggestions have been put forth on a volunteer basis, in good faith and in the best interests of the computer.

Feb 24, 2023 4:12 AM in response to PRP_53

from the link you kindly posted


Still can’t sign in
If you're using an app not made by Google and can't sign in, that
app's sign-in process might not be secure. Try updating to the latest
version of the app and look for the 'Sign in with Google' option that’s
available in many apps. You can also consider switching to a more secure app


Basically switch to another app as Mail doesn't comply with Google



P. Phillips wrote:

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

Fail to see from previous suppled link and again in above link the assertion in above Users reply

Go figure

Devil is in the details



Feb 24, 2023 4:23 AM in response to ays177


ays177 wrote:

sadly it doesn't work unless you get the two steps authorizations, giving a phone number to google... talking about privacy


Privacy? Phone number...?


The desire to use Google Mail while maintaining any semblance of privacy demonstrates cognitive dissonance. You fixated on a gnat and can't even see the elephant in the room.

Feb 24, 2023 4:41 AM in response to John Galt

All good to me, I just want to use the mail app, without having to setup two steps verification for the dozen emails I use... also I have other emails as Office3654 which do not work anyway on Mail - wouldn't apple be so kind to send a patch to those or is there a real good alternative? Thunderbird is working at the moment but it's graphic makes me wish I use a rapsberry Pi on Day to Day as it's more refined. DO I need to switch to Linux on my laptop just to use email? I am pretty happy with everything else this mac can do, I just want to use an email on it, you know, they thing I have been doing for over 30 years and suddenly is not working anymore due to corporate greed?

Feb 24, 2023 5:01 AM in response to PRP_53

Sure of course, I will use mail in browser, no one wins and possibly I will install linux on my laptop as it works... I remember when people were saying that Apple "It just works" I can't see how they can get this blow from Google and do nothing about it. You can't use MAIL app anymore in 2023. an email program. And it's not only google, it's office too.

Feb 24, 2023 5:05 AM in response to ays177

I surmise I could be more clear about it: Google has absolutely no incentive to let you use Apple's email client. None. There is nothing in it for them. Google and its parent company Alphabet exist for the sole purpose of harvesting and selling your personal information. If not for that fact Google would disappear. Poof. Gone. Wiped out. Google wants you to use something else.


Apple on the other hand embraces protecting personal information, has zero interest in selling yours, and actively incorporates those principles in their core business model. You don't have to use Apple's products or services either. If you don't agree with them, use something else.

Feb 24, 2023 5:06 AM in response to ays177

in any case thank you for your effort: these are my conclusion


BEST SOLUTIONS: Install Linux

SECOND BEST SOLUTION: get a windows latpop

THIRD BEST SOLUTION: use your browser

FOURTH BEST SOLUTION: thunderbird

FIFTH BEST SOLUTION: give up and start to use pen and paper.


thank you technology the only winners are those who gave up.


Mar 6, 2023 6:59 PM in response to John Galt

But Apple do insist you buy overpriced new equipment from them at an alarmingly increasing frequency to have that security and privacy, thus ensuring their bottom line. And considering Apple's market cap is about twice what Alphabet's is, that seems to be working for them quite well, but less so for we poor consumers who can no longer afford to fund their greed.

Mar 9, 2023 11:11 PM in response to The Animaster

in my case with High Sierra OS it doesn't work.

In the account list I have the old GMAIL configuration that doesn't work anymore. I cannot remove this old account otherwise it would be removed from all devices including newer ones. Therefore, the system won't let me create a new email account with the same email used in the old Gmail account.


I tried to disable the old Gmail account leaving it in the list but the problem remains.

Auth 2.0 Error 400 on Mail account

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