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hello, I use kratos version 0.7, register 1 account, then login ok.
After that, I upgrade kratos to latest version (current master branch), everything is ok (migration script ok, update a little bit config file then start kratos ok), but cannot login with previous account, got this error below:

```The provided credentials are invalid, check for spelling mistakes in your password or username, email address, or phone number.```
I checked that kratos config already have hashers config below, is there any step I missed?

```hashers:
  argon2:
    parallelism: 1
    memory: 128MB
    iterations: 2
    salt_length: 16
    key_length: 16```


I found the issue, it comes from config relating to identity

old config:
```identity:
  default_schema_url: file:///etc/config/kratos/identity.schema.json```

new config must change to schema with name = "default" (before I use other name and it doesn't work, when I update to default, login ok)

```identity:
  schemas:
    - id: default
      url: file:///etc/config/kratos/identity.schema.json
  default_schema_id: default```


Thanks! I will make a note to add this to
<https://www.ory.sh/docs/kratos/guides/upgrade>