If after doing this, Google still seems to be blocking Outlook from accessing Gmail, then you will need to change some settings in Google, not in Outlook. If you do it the other way around, the 587 may revert back to Port 25 which can cause connectivity issues.
The trick here is to choose TLS in the Outgoing server encrypted connection menu before typing ‘587’ in the Outgoing Server. Outgoing server encrypted connection: TLS.Incoming server encrypted connection: SSL.Try to add your Gmail account to Outlook once again, but pay careful attention when entering the server settings, which look like this: Reasons Why Gmail isn’t Working in Outlookīefore blaming Google for this issue, there’s something you can try first, especially if you set your account up using IMAP.