Enabling LTI Provider in tutor

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In tutor when overriding a featuer it’s important to note it should done at the env level, e.g. use a patch that shall mutate lms.env.yml or cms.env.yml This important because some featuers require furter settings/configuration to be applied for instance ENABLE_LTI_PROVIDER requires to install/add djnagoapps hence your error and this:

if FEATURES.get('ENABLE_LTI_PROVIDER'):
    INSTALLED_APPS.append('lms.djangoapps.lti_provider.apps.LtiProviderConfig')
    AUTHENTICATION_BACKENDS.append('lms.djangoapps.lti_provider.users.LtiBackend')

ref: edx-platform/production.py at d111be537519dc78b8604c6eebfd0c4e992c97b2 · openedx/edx-platform · GitHub
In the other words the above code wouldn’t run/evalute if you change it at the settings level but on config level (as suggested above by @michael) would make it evaluate.

And lastly some featuer requires other setup, may be you already aware of but just in case refer to this.