When I deploy Kratos with Helm it creates: kratos-courier-0. I get an error:

The configuration contains values or keys which are invalid:
The configuration contains values or keys which are invalid:
courier.smtp.connection_uri: <nil>
                             ^-- one or more required properties are missing

Are these two things related? Should I configuring connection_uri with the courier? Or is this some job that sends emails and I need to setup mailslurper, for example?

I've found that kratos does not start without that set. I just set it to something then don't set it up.

# We don't use this ATM, but kratos does not start without it.
courier:
  smtp:
    connection_uri: <smtps://test:test@mailslurper:1025/?skip_ssl_verify=true>

Ah, brill. I dont suppose you've seen this either?

selfservice.default_browser_return_url: <nil>

Getting this error but dont see it in helm chart values...

These values are in the kratos config - not in the helm values directly.