Welcome to the community! Thank you for your post. I'm sorry to hear about the trouble you're experiencing. I'd be happy to assist!
First, let's troubleshoot by going through the mobile setup steps with your Samsung Galaxy S7. Open the SoundTouch app, and when setting up a new device, select the Wi-Fi option. Try to go through the steps on screen, and let us know where you run into issues. Please describe any error messages you may see along the way. This will help us to better understand the issue and guide us in the right direction for further troubleshooting steps.