Logitech S520 Keyboard Not Connecting

I got this for my Logitech MX mini keyboard, does what it is made for.

Love this keyboard, good design by Logitech and very comfortable.

I've been using this keyboard since they came out from logitech. These are the only keyboard mouse combo i use.

This makes connecting monitors with laptop, keyboard, and speakers really nice.

I really enjoy the convenience of having a wireless keyboard and the K750 Solar Wireless Keyboard from Logitech is the best one in my opinion. It never fails me and is quiet and charges while not being used from normal light in my home.

I have been getting Logitech electronics for years. When I first purchased the MK710 Wireless Unifying Keyboard and mouse at least 10 years ago it immediately became my go to keyboard/mouse. Since my first purchase, I have gone through 3 of this item - due to my cats using my keyboard as a bed. I have looked at other paired keyboards and mouse, but always select the MK710 due to its comfort, ease of use, and because I love it. Until, and if, Logitech creates a better unifying Keyboard and mouse, and so far they have not, I will keep purchasing this item when needed.

I enjoy very much that Logitech MK270 Wireless Keyboard & Mouse. Although its a very comfortable product and my best keyboard choice, its still very cheap to get it!!

I got the best price and a rebate at B&H. The Logitech illuminated keyboard is totally slick. ...

Great for connecting gaming PC to IHS 2.1 speakers from Logitech. Fantastic sound quality from this cable and speaker combo

Please Please Please Logitech... Make a ChromeOS native version of this keyboard.. Yes, the current version works fairly well, but I'm sure many Chromebox, Chromebit, Chromebase users out there would LOVE to have an affordable keyboard with trackpad AND the full correct ChromeOS key layout. Please make this happen.