How do you recover your ability to log on if you lose the key?

Make sure you save the recovery codes when you set up 2FA / MFA.

Do the connectors retract? Looks as if they could be damaged carrying on a key ring in your pocket.

They do NOT retract, overall seems sturdy, I keep mine put up at home with a back up key in a safety deposit box at the bank. To make a copy after capturing the QR code with one key and saving the info, simply pull the key and stick the second one in and capture the same QR code, boom two copies, can do same with 2fa apps, the key is the same QR code, means same gateway sorta speak.

Does the yubi remained plugged into your device/pc the total length of time you are using device/pc, or do you unplug it once authenticated?

For OTP/U2F you only need it plugged in when you're prompted for the token (ie U2F on Github, Facebook, Google, etc.); It is a good security habit not to leave it plugged in. Yubikeys have many uses and while I don't know of any that require the Yubikey to be plugged in to maintain access you can use it as a "Smart Card" for logging into your computer (ie if the screen locks or you logout you will need it to log back in).

Manufacturer	Yubico
Part number	Y-291
Item Weight	3 g
Product Dimensions	4.03 x 1.2 x 0.5 cm; 3 g
Item model number	Y-291
Size	Keychain
Color	Black
Style	YubiKey 5Ci
Finish	Reinforced Fiberglass Material
Material	Polycarbonate
Shape	Rectangular
Item Package Quantity	1
Special Features	dual connectors for Lighting and USB-C ports
Included components	1 Yubico YubiKey 5Ci
Batteries Included?	No
Batteries Required?	No

YubiKey 5Ci

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