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Login popup appears since importing accounbt from other computer

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I imported info from Thunderbird on other computer. Now every time I open Thunderbird on the new laptop it says it can't reach my email server, incorrect login. If I enter my password it repeats the failure message. If I just close the message, the popup appears again, closing it again, it repeats once more, then closing it keeps it gone. Once I get the message to stop popping up by the repeat closings of the message, the related email account has already collected new emails so it was working. For what it's worth, the laptops are both Lenovo, the old is running Win10, the new Win11. Before the Import is was working fine, I only wanted to transfer my contacts, but the export grabbed everything. I don't have the issue on the original laptop I exported the info from.

I imported info from Thunderbird on other computer. Now every time I open Thunderbird on the new laptop it says it can't reach my email server, incorrect login. If I enter my password it repeats the failure message. If I just close the message, the popup appears again, closing it again, it repeats once more, then closing it keeps it gone. Once I get the message to stop popping up by the repeat closings of the message, the related email account has already collected new emails so it was working. For what it's worth, the laptops are both Lenovo, the old is running Win10, the new Win11. Before the Import is was working fine, I only wanted to transfer my contacts, but the export grabbed everything. I don't have the issue on the original laptop I exported the info from.
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