@thecudes Thank you for submitting the log! After having a closer look we see that it tries to connect, but fails stating that it is currently connected to another device.
Is this a Flic 2? (LED in the edge of press area)?
When pressing, make sure it is pulsating with a yellow light.
Also, when connecting, macOS will pop up a dialogue asking to confirm pairing. Do you get this dialogue?
To make sure you could perform a factory reset to clear any old pairings that might interfere.
Open the battery hatch by twisting the back side.
Remove the battery for 10 seconds, then re-insert it and immediately press and hold the Flic for 10 seconds. When releasing it should blink red fast 3 times.
Pressing again should show a red fade, this indicates that it has no pairings.
Now try to add it to the Flic app on your mac.
Please let me know if this helped!