As for the fn (Function) key, I haven’t found a way to reassign or customize it, but so far, I haven’t needed it. If you don’t use features like Dictation or emoji shortcuts, you probably won’t miss it either.
If you can’t resolve an issue with Contact Key Verification, you might be able to reset it: If you no longer have access to a device with iMessage Contact Key Verification turned on, you can reset it from the web: At account.apple.com, select Sign-In & Security, choose Contact Key Verification, then select Reset Contact Key Verification.
A recovery key is designed as an alternative to Account Recovery ( How to use account recovery when you can’t reset your Apple Account password - Apple Support ) which is where Apple helps you regain access to your account.
If only the key cap is damaged, then it should be possible to have Apple or an Apple Authorized Service Provider replace the key cap. However, Apple only has a complete key cap kit set so the price of a single key cap may be quite expensive (not as expensive as replacing the entire Top Case/Keyboard Assembly).
A recovery key is designed as an alternative to Account Recovery ( How to use account recovery when you can’t reset your Apple ID password - Apple Support ) which is where Apple helps you regain access to your account. However, "when you generate a recovery key, you can't use account recovery."
A recovery key is designed as an alternative to Account Recovery ( How to use account recovery when you can’t reset your Apple ID password - Apple Support ) which is where Apple helps you regain access to your account. However, "when you generate a recovery key, you can't use account recovery."
Do you really mean a security key? Or do you mean a recovery key? NOT the same thing. About Security Keys for Apple ID - Apple Support "You're responsible for maintaining access to your security keys. If you lose all of your trusted devices and security keys, you could be locked out of your account permanently." The information below is based on Apple's support article: Set up a recovery key ...
A recovery key is designed as an alternative to Account Recovery ( How to use account recovery when you can’t reset your Apple ID password - Apple Support ) which is where Apple helps you regain access to your account.
In the pop-up window, enter your Recovery Key. Go to the Security section and click Edit. Remove the device you no longer wish to use to verify your identity. If you have additional devices with Find My iPhone enabled, you can verify them as trusted devices. You can also add additional trusted phone numbers. If you lost your Recovery Key
A recovery key is designed as an alternative to Account Recovery ( How to use account recovery when you can’t reset your Apple ID password - Apple Support ) which is where Apple helps you regain access to your account. However, "when you generate a recovery key, you can't use account recovery."
