RAILWAY_TCP_PROXY variables empty

I'm trying to use global variables for my project. My process (done it a few times): 1) create the postgres DB in Railway 2) testing that the db works with my locally deployed version of the site (i.e., that I can load the tables) 3) promote the variables in the DB to become global variables 4) deploy the var When I convert the variables to global and then share them with the DB, the field becomes an empty string and the database is (understandably) unable to connect. What am I doing wrong? I tried reading the railway documentation but find that it's rather on the light side for someone with my level of experience. Thanks