Got it to work! Some combination of case-sensitivity (it needs to be all lower case, no matter what the brand name), and the failure to restore from DropBox but not giving an error was the issue.
Force-killing the Roomie app, and starting a restore again made it work.
There’s a very repeatable bug where a restore from DropBox fails, with no error. It just takes longer than one that succeeds, but doesn’t actually do any restore. Seems to happen close to 50% of the time, never the first time, very often the second time (after a clean app start).