Hi @Club Pilates Studio
Welcome to the Sonos Community!
Please try @John B‘s advice first.
If the Sonos app is on Microsoft Windows, please make sure Windows thinks your connected network is Private and not Public. (Windows Menu » Settings » Network & Internet » WiFi/Ethernet » [connected network] » Private)
Regardless of the type of computer, you may also need to open your firewall for Sonos. How to do this varies with Operating System and software installed.
If the computer uses a WiFi extender to connect to the network, this may interfere with Sonos communications. Try turning it off.
"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein