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

Alex Carlock 151

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 6 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.

Accepted answer

FARHAN HAIDER HAMZA 90 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
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3 people found this answer helpful.
bob mcmasters 0 Reputation points

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

This worked for me. Thanks!
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Amin Shahamiri 15 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.
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3 people found this answer helpful.
Bart 0 Reputation points

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

This solution also worked for me.
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Alex C 56 Reputation points

2021-06-23T18:07:22.86+00:00
We found a solution to this:

Custom OMA - URI - ./Device/AllowAddingNonMicrosoftAccountsManually

Value - Integer and set it to 1.

Deploy this to the device along side the mdm baseline

We are still determining if we want to allow this for everyone or specific users with a good business case.
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2 people found this answer helpful.
Aleksander Pawlak 31 Reputation points

2021-07-12T18:19:24.897+00:00

For me what helped was adding the following registry key to force Browser Emulation (compatibility mode) to IE 11 which supports Google sign in

HKLM:\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
Name: OUTLOOK.EXE
Value: 11000 (DWORD, decimal)

And to be on safe side, just adding these to sysWOW64 for 32bit emulation, + HKCU nodes for per-user experience. Worked! :-)

Tony J 1 Reputation point

2021-11-08T18:29:29.827+00:00

This also worked after I uninstalled IE11 and set this in HKLM, HKLM - WOW64Node and HKCU

John Martin 1 Reputation point

2022-02-22T21:08:09.917+00:00

Simply adding HKLM:\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION worked perfectly for me, no other modifications needed ... many thanks for the suggestion.

Kris M 1 Reputation point

2022-10-29T14:58:39.717+00:00

Well Done guy !! The tip do the job ! You're save me, one hour thar i search a tip for this problem.
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Alex C 56 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.
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Carol M. Chisholm 26 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
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Cannot add Gmail to Outlook: This browser or app may not be secure.

17 additional answers