Currently, SOLOSHOT3 supports passwords up to 20 characters long. A future software update will allow more characters.
If your password is more than 20 characters long, and you understandably don't want to change your WiFi password to accommodate this limitation, you can create a guest network on your router.
This is done by managing your router by typing “192.168.0.1” in your browser window, logging in as an admin (default is admin//admin), and finding the section that allows you to create a guest network. Different routers have different ways to create this, but router companies (such as TP-LINK) document these instructions very well. Please refer to your specific routers instructions.