Make sure your mail app isn't set to check for new email too frequently.
Then check the box of Manually configure server settings or additional server type. In Microsoft Outlook File Menu, choose to Add account. Try signing in directly on the Gmail app. But now that you have finished setting up Gmail for Outlook 2013, it is also available for you to configure Outlook for the Gmail on your own.
The email client's sign-in method might be insecure. Microsoft Outlook is an email program that allows you to manage multiple different email accounts with the same software.
If the tips above didn't help, visit and follow the steps on the page.
If you recently changed your Gmail password, you might need to re-enter your Gmail account information or completely repeat your Gmail account setup on your other email client.
Allow less secure apps: If you don't use 2-Step Verification, you might need to allow less secure apps to access your account.
Important: If you sign in with OAuth, use your regular Google password.
Use an App Password: If you use 2-Step Verification, try signing in with an App Password.
SETTING UP GMAIL ON OUTLOOK 2012 UPDATE
Update your email client to the latest version.
Nevertheless, you still can set up Outlook to automatically reply to some or all of your incoming email messages while you enjoy your vacation. Unlike the Exchange Server accounts, POP3 and IMAP account do not have the Automatic Replies feature (formally Out of Office Assistant). If you have these problems or can’t sign in, first check to make sure you’re using the right password. Setting up out-of-office auto reply for Outlook POP3/IMAP accounts.