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Error installing gmail account to Thunderbird

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I am trying to install my gmail account in Thunderbird, but I keep getting the following error: "Configuration could not be verified - is your username or password wrong?

Username is (myemailhandle)@gmail.com. I've verified that I'm using the correct password.

2-step verification is off, and I have allowed less secure apps, but still get the error.

I am trying to install my gmail account in Thunderbird, but I keep getting the following error: "Configuration could not be verified - is your username or password wrong? Username is (myemailhandle)@gmail.com. I've verified that I'm using the correct password. 2-step verification is off, and I have allowed less secure apps, but still get the error.

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What exactly are you doing when you're 'trying to install your gmail account in Thunderbird'?

Can you login to your account via webmail?