Linkedin oauth2

hi,
I tried to enable login or registration to OpenEdx by linkedin

I updated lms.env file

"FEATURES": {
     "ENABLE_OAUTH2_PROVIDER": true,
     "ENABLE_THIRD_PARTY_AUTH": true,
}


"THIRD_PARTY_AUTH_BACKENDS": [
        "social_core.backends.linkedin.LinkedinOAuth2"
    ]

and updated lms.auth

"SOCIAL_AUTH_OAUTH_SECRETS": { "linkedin_oauth2_key": "sercet" },

and I add by admin LMS the configuration for Linkedin in this page admin/third_party_auth/oauth2providerconfig

then I ran the reset LMS command
and when I tried to login or register by Linkedin
I got this error

Aug 11 18:51:46 [service_variant=lms][django.request][env:sandbox] ERROR [ ] [exception.py:135] - Internal Server Error: /auth/login/linkedin-oauth2/
Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 249, in _legacy_get_response
    response = self._get_response(request)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/utils/decorators.py", line 185, in inner
    return func(*args, **kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/views/decorators/cache.py", line 57, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/social_django/utils.py", line 49, in wrapper
    return func(request, backend, *args, **kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/social_django/views.py", line 23, in auth
    return do_auth(request.backend, redirect_name=REDIRECT_FIELD_NAME)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/social_core/actions.py", line 12, in do_auth
    for field_name in backend.setting('FIELDS_STORED_IN_SESSION', []):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/social_core/backends/base.py", line 31, in setting
    return self.strategy.setting(name, default=default, backend=self)
  File "/edx/app/edxapp/edx-platform/common/djangoapps/third_party_auth/strategy.py", line 34, in setting
    raise Exception("Can't fetch setting of a disabled backend/provider.")
Exception: Can't fetch setting of a disabled backend/provider.

Note: OpenEdx version hawthorn

Could you please make sure

  1. you have selected appropriate site while setting up oauth2 provider config( admin/third_party_auth/oauth2providerconfig)
  2. linkedin-oauth2 is selected as Backend name
  3. Other settings field has this value
    "SCOPE": [
        "r_liteprofile", 
        "r_emailaddress"
    ], 
    "FIELD_SELECTORS": [
        "emailAddress"
    ]
}