Authentication failed while adding alias to gmail


I tried to setup my “Send mail as:” at gmail but it keeps showing the “Authentication failed. Please check your username/password and Less Secure Apps access for” error message, even though I checked configuration on Less Secure Apps and it is turned on, and my password is correct.
I already went through the post How to set reply-to address for email forwarder but still not able to get this to work.
Do you know what else I am missing?
This is the screenshot on my configuration:

Thank you!!

Alias in gmail keeps being rejected

You need to have 2-Step Verification enabled on your gmail account and then you need to generate app password…In order to add reply to address.


Hey, it worked!! Thank you so much!
I had to enable the 2-Step Verification, and then generate an app password for my device.
You rock my friend!
Have a good one…