Question 1

Does this work as a two-factor authentication method for signing into outlook.com? If so, which browsers are supported?

Accepted Answer

Sure does.  In fact with Edge you can setup password-less logon to outlook.com.  with chrome and Firefox you can just use it as a second factor after the username and password.

Question 2

Does this have any kind of backup in case you lose it like some software based 2FA does? Or is it game over if it goes wandering?

Accepted Answer

You use this device as a 2 factor authorization which works with  3rd party software which you purchase separately .It has no software itself. It simply contains a chip which generates a Code which your software recognizes and as it needs to be Physically pressed by a human being it is not possible for hackers to program software to activate it.
If you lose it you simply deactivate your device in you software of choice. For example you could  use it with a password manager software which you purchase  separately. To login into a software you use a password , that is the 1st factor of Authorization, then you insert your Key and press the button , that is the second factor.So if someone gets hold of your password they still can't login in without your stick. It's almost Bullet proof if you ask me.
If you lose your Yubikey and wished to deactivate the Yubikey you would do  so via a mobile phone which you used to setup your software in the first place. For example you would receive an SMS or Email depending on the Software producer.

Question 3

Are these keys available to buy in England, they all seem to come from the US or EU with very long delivery times in many cases and no warranty.

Accepted Answer

I bought my first two keys from Yubico UK through Amazon last year but don’t know why they don’t appear here anymore. I bought my third key on Amazon which I think was through Amazon EU. It didn’t take that long to arrive, maybe a week or less. The only other option I can see is if you click on ‘see other sellers’ section and there are UK sellers listed but could be more expensive. Hope this helps.

Question 4

Can this be used in a normal usb-a port with an adaptor?

Accepted Answer

Thanks for your interest. Yes, it can be used with the correct adaptor, but we also offer USB-A keys (Yubikey 5 NFC) which may work better for your needs? https://www.amazon.co.uk/dp/B07HBD71HL?ref=myi_title_dp

ASIN	B07HBD71HL
Best Sellers Rank	753 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 1 in USB Gadgets
Box Contents	1 product
Brand Name	Yubico
Colour	Black
Compatible Devices	Mobile, Laptop, Desktop - Connect via USB-A or NFC
Compatible Phone Models	Personal Computer,Laptop,Smartphone
Customer Reviews	4.6 4.6 out of 5 stars (12,352)
Flash Memory Type	ohne
Global Trade Identification Number	05060408461426
Hardware Connectivity Technology	USB 2.0 Type-A
Hardware Interface	USB 2.0
Item Dimensions D x W x H	10D x 10W x 10H centimetres
Item Weight	0.1 Ounces
Manufacturer	Yubico
Manufacturer Part Number	Y-237
Model Name	Y-237
Model Number	Y-237
Network Connectivity Technology	NFC
Product Features	NFC
Product Warranty	2 year manufacturer
Unit Count	1.0 count
Write Speed	10

YubiKey 5 NFC - Two Factor Authentication USB and NFC Security Key, Fits USB-A Ports and Works with Supported NFC Mobile Devices - Protect Your Online Accounts with More Than a Password

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