Gmail / Google - Browser does not support Javascript when trying to add gmail account to Outlook 365

Though I solved the problem I had to add the gmail account (as I have in years past) as a generic imap account. Though when I first installed Outlook and it ran the accounts wizard, Google mail was a choice (as described the link you provided) it does not appear if you want to add an account to a list of existing accounts in Outlook.

For that you just have to set up 2 factor authentication in Gmail to open up the ability to add an App password. Add the gmail account in Outlook using the imap choice. You'll see the Google authentication box (one time) where you put in the gmail password (what you'd use at gmail.com to see your mail) and get prompted for the 2nd authentication. Do that and the account will be installed. The next time you restart Outlook you'll get an incorrect password for that account. This time add the App password you created, different from your gmail login password, and you'll be troubled no further.

Hope it helps.

Regarding the JavaScript error while trying to login to Outlook. It is occurring due to conflicting accounts. Please follow the steps once you have hold of the personal account's password.

1. Change the user's email from ******@yourdomain.com to ******@yourdomain.com in the console admin.google.com
2. Open a new incognito window and go to accounts.google.com or Gmail.com and sign in using ******@yourdomain.com (it is user NOT user1)
3. Sometimes the password won't work, this is because it was a consumer account which got merged with a workspace account. The password can be reset.
4. Once you acquire the password, Click continue in the next step and this is to release the account. In rare cases it'll ask to create a new account, please create a new account to release the conflicting account.
5. Make sure the account which you're logged in ends with @gmail.com after refreshing the tab.
6. Go back to admin.google.com and change ******@yourdomain.com back to ******@yourdomain.com and click save.
7. Login to Outlook and enter the Workspace password.

I'm having the same issue since 6/26/22. It worked perfectly for 6 months. Wondering if it has anything to do with transitions to Google Workspace. My other Google emails work fine. This one is a G-Suite email. But it still works perfectly on my Asus laptop. I've been on tech support twice with Microsoft. The last guy created a new profile for that email. It worked, but who wants to log in and out of your email all the time to check one email accoutn? Not me! So I deleted it and I'm back to square one. I'm about ready to drop Office and switch completely to Google.

I had a similar issue was resolved by following the fix mentioned in the link below. This fix has to do with a registry change for Microsoft outlook

https://support.microsoft.com/en-us/topic/error-this-web-browser-does-not-support-javascript-or-scripts-are-being-blocked-when-adding-a-google-workspace-account-b7cbc25e-5b2d-459a-97b8-c8b6adc7b2d4

Everything works the way it should.

thank you for this. was very helpful and easy as well