Having looked into this, the issue appears to be in your application code or configuration rather than the Railway platform itself, which puts it outside what Railway support can resolve directly.

This is exactly the kind of problem the Railway community is good at, so we'd like to open your thread as a community bounty. Railway pays a bounty to the community member who solves it, and threads like this usually get picked up quickly.

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What domain are you using?

db.boutique.training

it is in your configuration files. re check them

are you there?

This seems like an environment variable/configuration issue.

Well my grist dashboard canvas won't even load right now, so I can't check them. But last time I did, they appeared to be set up correctly.

Well my *Railyway dashboard canvas won't even load right now, so I can't check them. But last time I did, they appeared to be set up correctly.

Been like that for an hour

You need to add

 APP_HOME_URL=https://db.boutique.training

In variable tab of your grist service env.

This is the primary requirement for domain recognition