Thank you for taking the time to post on the Community - it's never a bother!
To confirm, you're trying to connect your SoundLink Mini 2 to your SoundTouch Wireless Link Adapter? If so, this will not be possible. The wireless link adapter is a receiver and will need to be connected to a device that transmits the Bluetooth signal (to play audio).
The SoundLink Mini 2 isn't a transmitter - could I ask what your aim is with both devices? Are you trying to play certain music on your Mini 2 speaker? I'd be happy to work with you to find how to solve this!