How can I log into my extra fb acct on messenger? I've done this before but it's not letting me this time

It said it couldn't find my acct, but the email was correct

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mysteryespresso ·

Need to login on browser

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swandfriends · 41-45, F

I have my main fb, and the extra one I don't use on an app, it's through the browser. But when I click to get to my message, it brings me to my messenger app. There's one other extra acct I successfully logged into once, but for this one it says it can't find the acct