I just set up my Internet Identity using my physical security key. I have another one that I wish to use as a backup in the event I lose my current one.

Please go through the process of generating and saving a recovery key. This can be done by logging into your account and adding an additional account recovery option. This would consist of setting up an additional physical key or a seed phrase that you’d be able to login with afterwards.

Note when creating a Recovery Seed Phrase: Please make sure to click Copy upon generating the Recovery Phrase to confirm. Failure to do so will not save the Recovery Phrase under your “Account Recovery” options. The identity anchor is the first part of the recovery seed phrase.