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Vanguard (where my company has their 401k plan) is one I have encountered that only supports a single Yubikey.

• bitskits 7y ago
  Not sure when you last checked, Vanguard supports up to 4 security keys.
  • zippergz 7y ago
    Oh, great news, thanks for letting me know!
    • PStamatiou 7y ago
      I just think Vanguard doesn't let you fully disable SMS though right? (but I only checked like a year ago..)