I'm having an issue in ArcCatalog where my feature class does not want to save the domain I created for it in the database. Every time I go into the field properties in my field within my feature class I try to save domain I want to use and it does not work.
A few things I tried:
- Recreating the database from scratch.
- Trying a different naming convention.
None of these worked unfortunately.
Does anyone have a solution? 
Thanks.
Here is my domain:

Here is my fields in my feature class:
