Gmail now requires Oa2 authentication which is not provided in Outlook2013. "Gmail OA2" refers to using OAuth 2.0 (OA2) for accessing a Gmail account, which is the modern and secure method to grant third-party applications access to a user's Gmail data. Instead of sharing a username and password, users authorize an application by granting it specific permissions, such as reading or sending emails, without revealing their password.
You can still access gmail on the web. If you require an email application to handle your gmail, your options include outlook new( which replaced the old windows mail app and is included with Windows 11), a newer version of MS Office , OFC365, or Thunderbird. There may be more that I am unaware of.