How to add a touch-ID-enabled MacBook as a new device to an existing Internet Identity?

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Update: this morning, I restarted my touch-enabled-MacBook, and then attempted to add the MacBook as a new device to II from the MacBook itself, at which point II presented the option of either using a security key or the MacBook’s Touch ID. With that option available, adding the new device was straightforward.

My two takeaways:

  1. Restart the misbehaving device, then retry.
  2. Unclear to me why Touch ID for II on the MacBook started failing in the first place - would be curious to hear if this is a known occurrence.
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