I managed an unsupported StarLink connected system for a while, with no issues, other than the seemingly obligatory StarLink dropout (every 10 minutes or so, for 10 to 15 seconds on all apps). 
Just because it’s unsupported doesn’t mean it won’t work. Double check that your Sonos system and the StarLink signal match the Sonos Network Requirements FAQ. If you can, try wiring your speaker to the StarLink device (I could not, no network ports on it, only WiFi.

Since Sonos doesn’t make a 5, do you have a PLAY:5 gen 1, gen 2, or a Sonos Five? Are you currently running S1 or S2? How was your system connected before StarLink? 

Sonos Play 5? Which generation? or is it a Sonos Five?

Lots of Starlink topics here, try an external search engine and add the site: option to search just these forums.

Worst case haul it off to a friends that had a supported Internet connection.

Thank You both Stanley_4 and Airgetlam for your comments. I  have a Sonos Play 5, not sure of how to tell the gen or version.

I was on a local Phome company- FIOS ISP previous and moved to the Starlink. The Play5 would not connect via wi-fi to the new starlink roputewr so I connected the unit via network cable directly to the Starlink Gen 3 router. Diagnostics performed and shared with Sonos Service Tech who provided no help.

I was able to read some of the topics in this forum regarding this issue and appreciate your input. I will have to do some more follow up to undertsand what options wil work to get my Sonos to connect. Frustrated that a seemingly high tech sound bar would be this technologically difficult to pair with the latest technology satelite ISP technology … all my other subscribed streaming services are not affected.

Thanks again for your comments

After doing some searching I am still confused why Sonos will not fix their deficiencies with their product. the SONOS security standards published on their site state that:

Supported WiFi modes and security standards

All Sonos products can connect to wireless routers or access points that support 802.11b/g WiFi over 2.4GHz. Additionally, all Sonos products can connect to WiFi networks that use WPA1 and WPA2 Personal security standards, as well as unsecured WiFi networks.

I have a Starlink Gen3 router, that has 2.4 ghz connectivity and the specs for it specifically state that they conform to:

Gen 3 router specifications:

• IEEE 802.11a/b/g/n/ac/ax standards
• Tri-band 2.4GHz and 5GHz
• 4x4, MU-MIMO, OFDMA
• WPA2 security
• Operating Temperature: -22°F to +122°F (-30°C to +50°C)
• IP56 rated (water resistant)

So this SONOS document says that the Play5 should connect based on the security  protocols in place but  it stays stuck in a mode where it says my Play5 is “Unregistered” and will not connect. I have connected the Play5 via Ethernet cable and rebooted the sonos and Router multiple times. If my router meets the security they expect it is up to Sonos to fix this issue.

Sonos could publish a more comprehensive list of exactly what services it needs to be available, it might be a bit daunting to look at and certainly very technical.

If you look around here you will see several other devices that do not fully support the (actual, not just published) requirements for Sonos to work properly. I recall a lot of aggravation on my new (back then) fancy router. Ubiquity folks see some issues too.

Fighting the situation or complaining here or to Sonos almost never have the desired result. Trying suggestions from folks that have seen the issues and worked around them is usually your best - get it working and quit giving me fits - solution.