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).

Does it work on 2020 ipad

Yes. The iPad Pro uses the USB-C connector. The regular iPad uses the lightning connector

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Description

🔑 Unlock elite security with the YubiKey 5Ci — your digital fortress in a key!

FUTURE PROOF SECURITY - FIDO-certified to keep you ahead in the evolving digital security landscape.
CROSS PLATFORM POWERHOUSE - Works flawlessly on Windows, macOS, Linux, Android, and iOS.
INSTANT TOUCH AUTHENTICATION - One tap to lock down your apps and accounts—no passwords needed.
SEAMLESS DUAL CONNECTOR ACCESS - Effortlessly secure iOS and USB-C devices with one sleek key.
UNRIVALED MULTI PROTOCOL SUPPORT - Protect all your accounts with FIDO2, OTP, Smart Card & more.

The Yubico YubiKey 5Ci is a compact, dual-connector hardware security key featuring Lightning and USB-C ports. FIDO-certified and supporting multiple authentication protocols, it delivers robust two-factor authentication across thousands of apps and platforms including iOS, Android, Windows, macOS, and Linux. Designed for professionals demanding seamless, passwordless security on mobile and desktop devices.

Specifications

Color	Black
Model Name	Y-291
Flash Memory Type	CompactFlash
Manufacturer	Yubico
Hardware Connectivity Technology	Lightning, USB Type C
Global Trade Identification Number	05060408461969
Item model number	Y-291
Hardware Platform	Mobile, Laptop, Desktop, Windows, macOS, ChromeOS, Linux
Operating System	Android, IOS, Mac OS, Windows
Item Weight	0.106 ounces
Product Dimensions	1.59 x 0.47 x 0.2 inches
Item Dimensions LxWxH	1.59 x 0.47 x 0.2 inches
Power Source	[Not Specified]
ASIN	B07WGJ1DNJ
Is Discontinued By Manufacturer	No
Date First Available	August 20, 2019

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