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

Alex Carlock 156

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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Carol M. Chisholm 26 Reputation points

2022-02-11T16:17:28.777+00:00

Nice idea. Unfortunately Windows 11 Enterprise Insider a preview build 22543 there is no such feature.
It looks to me like this is something that actually is built into Outlook
This is outlook for office 365 latest version.
I also tried the View in browser feature and that does not work
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Luke 11 Reputation points

2022-10-31T02:23:38.58+00:00
Use a browser to sign into the Google account you wish to add to Outlook.

Follow this link to authorize your Google account to be used with a new device or app.

Retry adding the Gmail account to Outlook 365. It should now work.
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1 person found this answer helpful.
Joshua Fritz 1 Reputation point

2022-12-29T00:15:37.677+00:00

I had to do this specifically in Edge.
But this is the fix.
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Cyndy Wall 5 Reputation points

2023-08-08T18:51:21.1866667+00:00

What fixed it for me was a "Internet Explorer Security zones use only machine settings" option in the Security Baseline Policy setting had to be changed from Enabled to Not Configured. Hope it helps.
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1 person found this answer helpful.
Jonathan Ansell 46 Reputation points

2024-01-25T16:26:45.33+00:00

Thank you for sharing this. This resolved by issue too.

Justus Bogner 0 Reputation points

2024-06-26T15:09:49.42+00:00

This also worked for me on Windows 11 with Office 365.
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Craig Haseler 0 Reputation points

2023-02-15T22:46:13+00:00

This started happening to us after enabling the Intune Windows 11 Security Baseline profile. Not sure what setting causes it but disabling that profile immediately fixes it.
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Cannot add Gmail to Outlook: This browser or app may not be secure.

17 additional answers