The Tracker cannot be paired to more than 1 device simultaneously. For example, if it is paired with your phone it cannot also be paired with your computer at the same time. 

If your Tracker is showing that it is connected but it isn't tracking time entries when flipped, the activities may have become un-assigned. If you clicked the "Forget Tracker" button or if you pressed and held the button on the Tracker for 8 or more seconds (which performs a reset on the Tracker) the activities will have become un-assigned and you'll need to re-assign them to your Tracker. 

Turn the Tracker off by pressing and holding the button until the LED lights up green and then let go

Quit the Timeular app by right-clicking the Timeular icon in the Window System Tray (near the clock) and clicking "Exit"

Press the "WINDOWS KEY" on your keyboard and type "Bluetooth" and open "Bluetooth and other devices settings"

Click the "Bluetooth" toggle switch to turn Bluetooth off. Wait a moment and then click the toggle switch again to turn Bluetooth back on

After that launch the Timeular desktop app again, navigate to Settings > Trackers and press the button on your Tracker to turn it on (you may need to click the "Pair" or "Connect" button in the Timeular app if the Tracker doesn't pair automatically)

Turn the Tracker off by pressing and holding the button until the LED lights up green and then let go

Quit the Timeular app by clicking "Timeular" in the menu bar at the top (when the Timeular app is focused) and clicking the "Quit Timeular" option

Open the macOS "System Preferences" app and click on "Bluetooth"

Click on the "Turn Bluetooth Off" button, wait a moment and then click the button again to turn Bluetooth back on

After that launch the Timeular desktop app again, navigate to Settings > Trackers and press the button on your Tracker to turn it on (you may need to click the "Pair" or "Connect" button in the Timeular app if the Tracker doesn't pair automatically)

Press WINDOWS KEY + R on your keyboard

Enter %appdata%\Timeular\logs including the % signs and click OK 

Go to the Timeular folder and copy the log.log file, the log.old.log file (if it exists) and if you're using a USB dongle (The USB Bluetooth dongle must be Bluetooth Low Energy compatible and must use a CSR8510 A10 chipset), please also copy the driverservice.txt to your desktop or any place you will be able to retrieve them later

Go to your Finder

Press COMMAND + SHIFT + G on your keyboard

Paste this Path ~/Library/Logs/Timeular 

Copy the log.log and log.old.log file (if it exists) to your desktop or any place you will be able to retrieve them later

Quit the Timeular app

Press and hold the button on the Tracker until the LED lights up green (approximately 3 seconds) then let go of the button. This will turn the Tracker off

In your Finder press COMMAND + SHIFT + G on your keyboard

Enter ~/Library/Application Support/ and click Go

Delete the Timeular folder

Re-launch time Timeular app (you'll need to log in again) and go to Settings -> Trackers

Press the button on the Tracker once to turn it on

The Tracker should appear on screen with a "Connect" button to the right of it. Click the "Connect" button

Quit the Timeular app

Press and hold the button on the Tracker until the LED lights up green (approximately 3 seconds) then let go of the button. This will turn the Tracker off

Press WINDOWS KEY + R on your keyboard

Enter %appdata% including the % signs and click OK 

Delete the Timeular  folder

Re-launch the Timeular app (you'll need to log in again) and go to Settings -> Trackers

Press the button on the Tracker once to turn it on

The Tracker should appear on screen with a "Connect" button to the right of it. Click the "Connect" button