How to grant permission to external application to use Gmail account?
Step1: Login with your Gmail Account.
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Step2: Click on My Account.
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Step3: Click on Device activity & notification.
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Step4: Enable Allow less secure apps.
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Step5: How to Unlock Captcha.

Visit below Link to unlock Captcha :
https://accounts.google.com/DisplayUnlockCaptcha

Press Continue to allow Gmail.
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Step6: At last Sign out Account.
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