Probably wouldn't do any good, call the people that did the work and tell them their installation is failing. They probably glued it because it saved them time. I have never seen this before.

Once you get this repaired, it's good practice to open and close these valves on your sinks and toilets 2 or 3 times a year. Keeps them operating properly so they work when you need them to.

If it truly is a "new" tiny home. The square footage cost on those warrent a call to the builder. Tell him to get his ass over and fix it.