chock-a-block In the past, they said a FIDO2 implementation developed by GrapheneOS would only use the the Titan M chip, not USB/NFC/BT

dirksche

Yes, you can. With PayPal - if you activate two-step verification - it's even necessary to set up OTP as an alternative to security keys because unfortunately at the moment you can only store one security key with PayPal - for this alone it is necessary to have an alternative access option if you lose the security key.

You can set up the second factor in your PayPal account under settings>security>two-step verification.