Using Classic Outlook on Windows for personal email, calendar, and contact management
This fixed it for me: 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
Basically, add the below regkey and restart Outlook.
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION]
"Outlook.exe"=dword:00002af9