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There's so much I don't understand in Dashlane's disclosure that an attack on its user accounts resulted in the threat actor obtaining 20 encrypted vaults.

https://support.dashlane.com/hc/en-us/articles/36038764990866-Security-advisory-Brute-force-attack-on-Dashlane-user-accounts?7194ef805fa2d04b0f7e8c9521f97343

What does it mean to brute force 2fa? Are we talking about TOTPs? That doesn't make sense because TOTPs change every 30-90 seconds, so there's no way for an attacker to meaningfully exhaust key space before it resets all over -- unless the attacker has the ability to pump all 7,700 combinations in <90 seconds, and DL doesn't have any sort of rate limiting.

Also, if the attacker is brute forcing 2fa, doesn't that by necessity mean the attacker already defeated the first factor? How did that occur?

I don't know if my confusion is the result of me not knowing the how the Dashlane product works or if it's just Dashlane being opaque.

Can anyone help me read the tea leaves?