How to get gmail app password?
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Step 1: Active google's 2-Step Verification
1) Log in your google account, go to "Security" page, click "2-Step Verification"

2) Input your phone number, click "Next" button

3) Enter the sms code you received, click "Next" button

4) Click "Turn On" button to complete 2-step verification

Step 2: Get app password
1) Go to "Security" page, click "2-step verification" again

2) Slide the page to the bottom, click "App passwords"

3) Input "App name", click "Create"

4) You will get gmail app password (16 letters) as below

You can refer to this article: