Best answer by zBernie123
Turn off the speakers in the sun room and ensure they disappear from your Sonos Controller app list of rooms completely.
Remove the Sonos Skill in the Alexa App and remove all the Sonos speakers from the smart-home devices section.
Switch the sun room speakers back on... give them a few minutes to settle.
Open the Sonos App and ensure the Sun Room speakers have now reappeared ... you should not only see them in the assigned room but also in the “Settings/About my Sonos System” section
Once the speakers have returned correctly to the Sonos Controller App, reopen The Alexa App and add in the Sonos Skill and re-link your Sonos and Alexa accounts and finally rediscover your Alexa devices.
See if those few steps resolve your issue with the sun room devices.
I tried what you suggested and the problem persisted (See my previous reply). What I did to get it working again was delete the Play 1 pair named Sun Room from Alexa's device list. Then I renamed it "Man Cave" in the Sonos app. Then I rediscovered devices in Alexa, and low and behold, I can play music on Man Cave using Alexa. I kinda like the new name too!
Thanks for your help with this.