I've noticed that I'm getting a 403 when trying to update a user's details via an action, but I'm still able to sign up new users. I tried to look at the log on fly, but it gave me limited information. When I went on Fly, I also saw this:
Getting the following from fly:
Symptom: App is not listening to the expected port
Something in your code or configuration is preventing your app from listening on 0.0.0.0 at the port specified by your fly.toml internal_port 8080. Your users will see error 502 accessing your app. This is an issue with your application code.
Your app could be missing environment variables. Some frameworks require specific environment variables to be set otherwise they stop your app.
The app could be listening to the wrong port, you can either change your fly.toml internal_port or modify your application code to listen on the correct port.
Make sure your app is listening to 0.0.0.0 and not localhost or 127.0.0.1.
Your app could not be listening at all, check your logs to make sure it's running correctly.
After making the necessary changes, you can deploy the updates from the deployments page or fly deploy on your computer.