I have 4 Soundtouch devices at home. Make sure to give all of them a static ip and do not use autodiscovery. If they aren’t discovered with manual setup in configuration.yaml try to add the port to the config. With this config they work nicely for me:
@officerNordberg@mwajer
In case you are still using Bose SoundTouch speakers with Home Assistant, I have developed a custom component called SoundTouchPlus that breathes new life into the SoundTouch support. Here’s some more information in another thread on the details if you want to check it out.
Check out the GitHub project wiki for more detailed information and installation instructions (easy HACS install).