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Can't add 2d email account

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I bought a new Macbook Air computer. I am unable to add one of my two email accounts to Thunderbird. The first works without a problem. When trying to add the second account I get the following error message:

"Unable to login at server. Probably wrong configuration, user name or password."

The user name and password have been entered correctly. The email account that I cannot enter is hosted by google.

I have both email accounts on Thunderbird on 3 older computers which work fine.

Thanks in advance for helping me sort this out!

I bought a new Macbook Air computer. I am unable to add one of my two email accounts to Thunderbird. The first works without a problem. When trying to add the second account I get the following error message: "Unable to login at server. Probably wrong configuration, user name or password." The user name and password have been entered correctly. The email account that I cannot enter is hosted by google. I have both email accounts on Thunderbird on 3 older computers which work fine. Thanks in advance for helping me sort this out!

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Update to the issue:

When I changed from IMAP automatic configuration to POP3, the user name and password appeared to be accepted, but generated the following error message:

"The STAT command did not succeed. Error getting message number and sizes. Mail server pop.gmail.com responded: [AUTH] Invalid credentials"