Bluetooth won't recognize Logitech mouse

Steps taken from "BayArea Shopper[amazon]" posted 8/27/16 which worked for a solution on Mac:
1. DO NOT plug in your USB Bluetooth dongle before starting. (If you already did, unplug it now)
2. Open your Mac System Preferences, select "Bluetooth" under System Preferences.
3. At bottom of the window is a checkbox: [ ] Show Bluetooth in menu bar..... Click box so it shows a checkmark.
4. You should now see the Bluetooth icon in the Mac Menu Bar.
5. Hold the OPTION KEY down and click Bluetooth Icon in Menu Bar. This will drop down a menu which shows some additional info than just a regular click on the Bluetooth icon. Look at line 3, which starts with the word "ADDRESS:" You'll see a sequence of numbers and letters something like the following: 00-22-41-CE-46-24 (The letters and numbers you see may be different- that is OK!) Also, this line is greyed-out on the screen. That's normal. This is the specific address of the Bluetooth transmitter currently in use internal to the Mac device. If you did not yet plug in your USB luetooth dongle, the address you see should be your Mac's built-in Bluetooth adapter.
6. Now cross-check this information because it is the way to know when your new Bluetooth dongle is activated and in use: Click on the APPLE icon in the menu bar, select "About this Mac". In the pop-up window that shows, at the bottom of that screen is a button "System Report". Click it.
7. You should now see your full system report. Column 1 begins with header "Hardware": The 3rd line down is "Bluetooth"- click to select it. Now on the right side of the screen is the full set of specs for the currently-in-use Bluetooth transmitter. Look at line 2 which also begins with the word "Address". You should see the exact-same sequence of numbers and letters as in Step 5 above. Take a screen shot of this info- it is helpful so you can tell between this address and the Bluetooth transmitter address of your new USB-dongle. (Screenshot: Press Command-Shift-4 - Now marquee-select the area of the screen you want to capture; as soon as you release the wired mouse or trackpad the screenshot is taken)
8. Now go back to the Bluetooth icon in menu bar and click. Select "Open Bluetooth Preferences"
9. In the Bluetooth system preference screen, in the left column is the Bluetooth ON / OFF switch: Click to turn Bluetooth off. (If it is already off, then click it ON, then click it OFF right after.)
10. Wait 3-4 seconds and then insert the USB Bluetooth dongle into a USB port on your Mac.
11. Activate your Bluetooth device such as a mouse, and switch it into "Pairing" mode.
12. Your should see the name of that device appear a few seconds later in the right-hand column of the Bluetooth System Preferences screen. To the right of it you should see a button appear that says "Pair". Click on Pair. Moments later your device should now connect. When it does connect it will say "Connected" underneath the device name.
13. The USB Bluetooth device should now be working. Verify now that the dongle's Bluetooth transmitter is the one that is connecting your device, and not the Mac's built-in Bluetooth. OPTION-click on the Bluetooth icon in the Menu Bar; a menu drops down; on line 3 you will see "Address" followed by the number-letter sequence of the currently operating Bluetooth transmitter. Your Bluetooth dongle *may* have a MAC (media access control, not to be confused with a Mac device) address like 00-1A-7D-DA-71-06, or similar format.
14. You can also cross-check this number/letter format by repeating steps 6 and 7 above. One of the ways you will know FOR SURE if this is the Bluetooth adapter in operation is checking the line "Manufacturer:" ... It should say the name of the manufacturer different than the native one internal to the Mac device. If it does not, try to repeat the entire sequence. You should also see the name of your connected Bluetooth device under the sub-head "Devices (Paired, Configured, etc)."

Hi,

Following above steps you still need to plug the USB dongle into the Mac. Is this the way to pair the mouse without using a USB dongle?

Had this same problem which was solved by purchase of CORRECT Bluetooth device variant. Understood that this is a reply over a year from OP, but response is posted here specifically for the latest Logitech Mouse MX Master 2S (July 2017); which is, similar in function to OP's device. As another person mentioned before, these are devices, that according to Logitech, work with Bluetooth "Smart Ready" devices. The problem is older Mac devices are Bluetooth compatible, but not Bluetooth "Smart Ready." There is a difference. Even Bluetooth 4.0 will not work unless it has the "Smart Ready" designation along with it. There are a number of aftermarket Bluetooth "Smart Ready" USB dongles which will solve this problem once plugged in either to your PC or Mac device. Just be careful, as many of these devices do not come with Mac OS support; look for one that specifically states Mac OS support before you acquire. These Bluetooth "Smart Ready" devices work fine on most versions of Windows and later versions of LINUX, but unless it explicitly states Mac OS support, keep looking. On a related note, Bluetooth 5 (technically Bluetooth 4.2, but standardized to just Bluetooth 5 without a decimal) was released as a protocol in December 2016, but the market, as of July 2017, has yet to see Bluetooth 5 USB dongles that have native "Smart Ready" and Win/Mac device compatibility.

Additional follow-up: It has been found also that some of these Bluetooth (Smart Ready or otherwise) devices will work if plugged into a USB port on a Mac device so long as the native Mac Bluetooth adapter is disabled. That is, the Mac device will recognize the USB Bluetooth device, but it still will not work unless the native internal Bluetooth adapter functionality is disabled. In other words, home computers, generally, can only have one Bluetooth radio adapter/device working at a time. Mac will default to its own internal Bluetooth adapter first with most PCs experiencing device conflicts if more than one Bluetooth radio adapter is attached to the system.

thanks, this finally connected my Logitech Mouse MX Master 2S. the dongle came with the mouse, I just never needed it until I upgraded my software. Strange because my new MacBook Pro connects fine, but my Mac Pro from 2012 didn't.

According their site, the mouse works with "Bluetooth Smart Ready device".

http://www.logitech.com/en-us/product/mx-anywhere2 ( Check System Requirements in TECHNICAL SPECIFICATIONS section )

Bluetooth Smart Ready on Mac means Bluetooth 4.0 hardware with Yosemite or later.

Unfortunately BT on your Macbook Pro (mid 2010) is BT2.1+EDR

( If you want to be sure, Logitech provides a procedure to check the PC/Mac is Bluetooth Smart Ready or not )

http://support.logitech.com/en-us/article/Check-for-Bluetooth-Smart-support-on-y our-computer?product=a0qi0000006Njj9AAC

I guess your only option is use of USB hub if you don't have available USB port,

Greetings kgmn,

Thanks for using the Apple Support Communities!

I understand that you haven’t even able to successfully pair your Logitech MX Anywhere 2 mouse with your MacBook Pro running Yosemite.

According to the Logitech MX Anywhere 2 technical specifications, this mouse is compatible with your computer and operating system.

Mx Anywhere 2 Wireless mobile mouse

To troubleshoot this situation, I would recommend reading over and working through the steps outlined in the following article. This article has information about pairing your Bluetooth device with your Mac as well as how to connect multiple Bluetooth devices.

Using a Bluetooth mouse, keyboard, or trackpad with your Mac - Apple Support

Have a great day!