Cannot add Gmail to Outlook: This browser or app may not be secure.

Alex Carlock 206

I'm trying to add my Gmail account into Microsoft 365 Apps for Enterprise Outlook version 2104 build 13929.20254 Click-to-run 64 bit. I go to File --> Add Account --> enter my gmail.com address and click connect. Another screen pops up with my email address pre-populated and I click Next, which brings me to this screen:
Couldn't sign you in
This browser or app may not be secure. Learn more

Try using a different browser. If you’re already using a supported browser, you can refresh your screen and try again to sign in.

We've modified a lot of Windows Internet Settings, but I can access Gmail through IE and my default Edge Chromium browser. So why doesn't it work when accessed through Outlook? Outlook appears to be using some version of IE instead of my default Edge browser. Does anyone know why that is, or exactly what setting needs to be enabled for this to work?

Thanks.

ArchyinVA 11 Reputation points

2021-05-29T05:29:21.887+00:00

I was able to go here: https://myaccount.google.com/u/0/security and turn on access to less secure apps while I signed in. Once sign in completed and Outlook started populating with data, I closed Outlook, turned off access to less secure apps, and I still had my gmail syncing.
Luke 11 Reputation points

2022-10-31T02:19:55.45+00:00

Was getting the same insecure browser error in Outlook 365 when trying to add a Gmail account. What worked for me was to go to this link which alerts your Google account you're about to add a new device or app to it. Once clicking Continue, go to Outlook and try adding the Gmail account again. This should work.
https://accounts.google.com/DisplayUnlockCaptcha

Edit August 2023 -- That link no longer appears to work. This error still occurs in Outlook 365 for Windows sometimes when trying to add a Gmail account, but I think I've finally found a definitive solution -- just keep trying over and over and eventually you'll get to the Google password screen. I find it takes about 4 or 5 tries, but I can repeat this success if I stick with it. Once you get prompted for your Gmail password, you're in the clear. Enter the password associated with the mail account and hit next. If you have TFA enabled you'll need to authorize the sign-in and then allow Outlook access, and that's it.
Peter Benda 5 Reputation points

2024-08-14T23:10:05.88+00:00
Thanks to Nalinda! This is from her comment posted beneath Farhan's accepted answer.

THIS WORKED FOR ME:

Nalinda Prematilake •

0 Reputation points

Jul 26, 2024, 4:39 PM

I was able to fix the issue by login into the Gmail account going to security(https://myaccount.google.com/u/0/security) and setting up a PASSKEY for Gmail security on the computer needing Gmail added on to Outlook.

Then go to Outlook->File->Account settings and add the Gmail account as usual

Accepted answer

FARHAN HAIDER HAMZA 95 Reputation points

2024-03-04T21:43:53.03+00:00

Hi @Alex Carlock I Have Finally Solved This issue "Couldn't sign you in This browser or app may not be secure. Learn moreTry using a different browser. If you’re already using a supported browser, you can refresh your screen and try again to sign in."

Actually its an issue inside microsoft edge not in your outlook... First you need to go to your computer Settings > Default Apps > Default Browser and then select Microsoft Edge as your default browser,

if you already have Microsoft Edge as your default browser then you can skip this step... After doing this, now go to Microsoft Edge and Type this text below in the address bar....

edge://settings/defaultbrowser

Like in the screenshot below i have attached... ******Now see the option "Allow Sites to be reloaded in Internet Explorer Mode (IE MODE)" Select Don't Allow and now Go to Outlook and Add Your Gmail Account, Now it should not give any problem. I Hope this will be helpful
Please sign in to rate this answer.

4 people found this answer helpful.
bob mcmasters 0 Reputation points

2024-05-29T21:24:32.2566667+00:00

This worked for me. Thanks!

Jeffrey Klenk 20 Reputation points

2024-07-21T17:40:58.3266667+00:00

Didn't work...any other ideas?

Nalinda 5 Reputation points

2024-07-26T20:39:10.6333333+00:00

I was able to fix the issue by login into the Gmail account going to security(https://myaccount.google.com/u/0/security) and setting up a PASSKEY for Gmail security on the computer needing Gmail added on to Outlook.

Then go to Outlook->File->Account settings and add the Gmail account as usual

Patrick 0 Reputation points

2024-08-11T11:59:58.2433333+00:00

thanks!
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.

20 additional answers

Amin Shahamiri 30 Reputation points

2023-09-10T16:12:11.0433333+00:00

I fixed the issue by adding https://accounts.google.com/ to the Trusted Sites.

1- Press Win+R and enter inetcpl.cpl to open the Internet Properties window.

2- Select the Security tab, click on the Trusted Sites, and press the Sites button.

3- Add the https://accounts.google.com/ to the trusted websites.

4- Try to add your Gmail account to Outlook.
Please sign in to rate this answer.

6 people found this answer helpful.
Bart 0 Reputation points

2023-09-11T13:23:24.6466667+00:00

This solution also worked for me.

Mark Roth 0 Reputation points

2024-10-23T22:55:31.5966667+00:00

This worked for me. Thank you!

April 0 Reputation points

2024-10-30T22:14:32.8233333+00:00

This worked after I edited the trusted sites through GPO.

Computer Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page >> Site to Zone Assignment List

Enable

Value Name - https://accounts.google.com/
Value - 2

Then in command, run

gpupdate /force

This command worked it out without rebooting the computer.

Then add google account on Outlook.

Microsoft 365 Apps for business
Microsoft Outlook for Microsoft 365 MSO (Version 2409 Build 16.0.18025.20160) 32-bit
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
Alex Carlock 206 Reputation points

2021-05-07T13:40:54.397+00:00

No. This issue is not resolved. We cannot add a Gmail account to any Outlook profile on corporate computers, but we can add the same Gmail account to a non-corporate computer, so we know it's related to the IT settings we set and not the Gmail Account. The problem is still that we don't know exactly what setting is causing this issue, why the setting doesn't prevent Gmail login in the Full IE browser but it prevents it in the mini Outlook Authentication browser, or why Outlook even still seems to use the mini IE browser instead of the Computer's default browser (in my case that's Edge Chromium).
Please sign in to rate this answer.

4 people found this answer helpful.
Carol M. Chisholm 46 Reputation points

2022-02-22T10:37:13.547+00:00

I am looking at Azure AD joined systems...

Gregor Herda 0 Reputation points

2024-07-29T11:22:19.4433333+00:00

Issue persists still. Can add Gmail to Outlook running on a personal laptop but not on an organisational one. Outlook Version is Microsoft® Outlook® for Microsoft 365 MSO (Version 2406 Build 16.0.17726.20078) 64-bit.

April 0 Reputation points

2024-07-29T16:18:08.9566667+00:00

Agreed. As said here, Outlook is not using computer's default browser and also I do not believe that small popup browser for logging into Gmail is Edge. I could login to Gmail successfully without any issues with Edge, but I still can't add my Gmail account to outlook because Gmail thinks the small popup browser is unsecure. --------------------EDIT--------------------

After I posted this, I tried a few more things and it moved a little bit forward, but still getting stuck.

I looked into registry as someone here had mentioned, and did make a change to:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION

Name: OUTLOOK.EXE

Value: 11000 (DWORD, decimal)

Then I changed the default browser to Microsoft Edge, reboot the computer, and tried to add Gmail in Outlook, which did allow me to connect to Gmail account; however after I did 2-factor authentication, it popped up this, and the buttons at the bottom ("Deny" or "Allow") were greyed out so I could not move forward to add Gmail account in Outlook.
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
Carol M. Chisholm 46 Reputation points

2022-02-23T08:42:09.557+00:00

Still trying - I changed the reg key and it got worse.

there is definitely some sort of embedded IE in Outlook.
Add account, wait, script timeout, Javascript not enabld message (it is enabled in Edge and Chrome)
The learn more brings up and IE logo!!!!

and there is a hung process
Please sign in to rate this answer.

4 people found this answer helpful.

0 comments No comments
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
Alex C 61 Reputation points

2021-07-13T21:55:46.04+00:00

welp, the Custom OMA - URI - ./Device/AllowAddingNonMicrosoftAccountsManually solution we found doesn't seem to be working any longer. alexpawlak's solution may be working so far, but I want to test for a day or two to be sure things don't stop working again.
Please sign in to rate this answer.

3 people found this answer helpful.

0 comments No comments
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.

Share via

Cannot add Gmail to Outlook: This browser or app may not be secure.

20 additional answers

Your answer