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Login credentials fail for a site after csv password import

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Exported passwords as csv from Firefox from an ailing machine. Imported into browser on new pc and find two sites reject my logins (Outlook & Duolingo). No issues with any other logins. Same logins still working on the old pc. What gives?

Exported passwords as csv from Firefox from an ailing machine. Imported into browser on new pc and find two sites reject my logins (Outlook & Duolingo). No issues with any other logins. Same logins still working on the old pc. What gives?

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