Auth 2.0 Error 400 on Mail account

This does work. You have to select use other account instead of selecting gmail and type in your email address and password.

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.

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

Try adding a new one inserting a "." on your e-mail (***@gmail.com -> ***@gmail.com), the Mail App will detect as a new e-mail but gmail ignores all "." before "@"... Try sending a email to you with this alias and will see.

[Email Edited by Moderator]

This is the only answer I've found that worked ....thank you so much.

• 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

i do not want to upgrade beyond high sierra. the OS is only 5 years old and a stable one for me. time to stop using gmail. it's ridiculous they're ending support for legacy flows.

The person that said it didn’t work, needs to delete their mail account first. Then follow the steps to reinstall

This is so frustrating. I am using a MacBook Air 2015 and cannot install gmail onto the mail app. What is the resolution to this? This has never happened and now I cannot get my emails on my laptop... I know the various route for installing email this is not the problem.....

I found a solution, go to https://myaccount.google.com/u/0/apppasswords and create a password for Mac. The problem is having two-steps verification activated.

Updated: Sorry, it doesn't work at this moment.

I also use High Sierra,
but in my case at the end of the procedure the MAIL app tells me that the account already exists.
I cannot remove the old Gmail account otherwise it will also be removed from the other devices
(iphone 14 and Imac)

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.

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.

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.

Error 400 in the context of OAuth 2.0 typically indicates a "Bad Request" error. This error message is usually returned when there is an issue with the request sent by the client.

In the context of a Mail account, this error may occur if there is an issue with the authentication process. It's possible that the authentication token has expired, or there is an issue with the client's credentials. It could also be an issue with the API endpoint or the authorization server.

To troubleshoot this issue, you may want to check the following:

1. Check that the authentication token is still valid. If the token has expired, you will need to obtain a new token.
2. Ensure that the client credentials are correct. If the client credentials are incorrect, you will need to obtain the correct credentials.
3. Verify that the API endpoint is correct. If the endpoint is incorrect, you will need to update it drain mansion apk.
4. Check the logs or error messages for more information on the specific issue that caused the error.

If none of these solutions work, you may want to contact the Mail provider's support team for further assistance.