I changed my Google password for security reasons but when I try to update my email account password in Mail on my iMac, I get an Error 400:invalid_request message saying Mail (my version is 11.5) does not comply with Google's OAuth 2.0 policy - so won't let me update my password and take my Mail account online.
Any advice on how to get round this?
My iMac is an old 2009 version, using High Sierra, 10.13.6
thanks
iMac, macOS 10.12
This might be fine if your iMac is a within a certain age but with a mid-2010 or 2011 iMac, running High Sierra 10.13.6 is as high as Apple will allow the OS to go.
I get exactly the same problem as reported above - all my Gmail accounts within the Mail app are suddenly non-operational because I changed the password as part of a security review (prompted by Google) and from this point I have been unable to receive mail to my Gmail account using the Mail app on my iMac. The password field does not appear on the Details screen within the Internet Accounts part of Systems Preferences - I get the following:
You can't sign in to this app because it doesn't comply with Google's OAuth 2.0 policy for keeping apps secure.
You can let the app developer know that this app doesn't comply with one or more Google validation rules.
So I am letting the app developer know so that Mail can be updated to cope with it...and asking for this upgrade will be available to users of Mail on High Sierra. Currently I am running Mail v 11.5 (2018).
The only workaround I can use on the iMac at the moment is webmail.
Having the same problem here but I use Microsoft Outlook for Mac. My OS is High Sierra 10.13.6 and it won't get updated, as my MacBook is 11-yrs old :(
I need to fix this so that I can have all my calendars for 6 diff. clients (exchange & google) in one place.
Any help?
Thanks
Same problem on Sierra (10.12.5) with a 2013 MacBook Pro. I have spent the better part of 2 hours attempting all the fixes recommended. No joy.
If anyone figures out a fix, please upload the instructions. As of July 11, 2023, the existing recommendations (above) in this thread have not yielded any results.
Hello,
I'm using 10.12.6 macOS Sierra and Mail app 10.3.
I can't update to a newer version as I am also living the great life of not having to subscribe to Adobe Creative Cloud, Quicken or QuickBooks right now and I'd like it to stay that way.
I had to reset my daughter's school password to her school google account and now I'm getting this message.
I couldn't change any passwords because there was no place to do so.
So, I deleted the gmail account, thinking I could just re-add it and this same message comes up if I even hit the "+" sign to add any google mail account to my mac computer.
If you figured this out, can you please send me a very detailed step-by-step way of fixing it. I just keep getting pieces from here and there. I have set a 2-step authentication, I have tried adding a separate password for the mail app for my mac. I just don't have any option to put the 16-digit password anywhere now because I can't even get past this message to try and add a google mail account to my mac. I'm concerned that the only way to fix this is to upgrade my OS, but as I said, I really don't want to do that if you found a better way.
Thank you.
Yes, now mine has quit working in 10.13.6 also, still works in 10.14.6
Just asking, don't Calendars work in a bowser at outlook.com?
I havent tried using Outlook online. Just Outlook desktop
Can't update to Catalina if the hardware is so old it won't allow it.
👍
Great to hear my friend.:P
Hi all, I'm stuck to Catalina 10.15.7 on my iMac. I wonder if there is any way to add my 6 gmail accounts using the CalDAV option in Calendar.
Thanks
Does anyone know if the same issue happens with Big Sur?
Is there any way around this?
Are Apple able to minority upgrade mail to that it will run on OS 10.13.6, please - Until I buy a new mac!
meant minor-ly. I have one gmail address that works and one that now doesn't. It can't be inately incompatible. Apple mail & Gmail are just not politely shaking hands....?
Should not happen in Big Sur.
No longer able to upgrade beyond the 10.12.6 I have.
So? Out of luck on using Mail since I changed my password?
Mail and Google's OAuth 2.0 policy
