Method not allowed as response : For LTI provider config

I have been trying to set up my Openedx as an LMS Provider, following “https://edx.readthedocs.io/projects/edx-installing-configuring-and-running/en/latest/configuration/lti/enable_lti.html”.
However, when I try to authenticate as Anonymous User, LMS responds with 405 response code.

Setup Info:

1. EDX is tunning in local system 
2. LTI consumer : Postman (*just for testing)

Sample Request:

curl --location --request POST ' http://localhost/auth/login/lti' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode 'custom_tpa_next=%2Faccount%2Ffinish_auth%2F%3F' \
--data-urlencode 'user_id=cmt-tool' \
--data-urlencode 'oauth_consumer_key=15828cb66e3a0b147f29' \
--data-urlencode 'oauth_signature_method=HMAC-SHA1' \
--data-urlencode 'oauth_timestamp=1584986936' \
--data-urlencode 'oauth_nonce=PmiihWIU6Nw' \
--data-urlencode 'oauth_version=1.0' \
--data-urlencode 'oauth_signature=AUcwKxNxiTEDTmzD9K0OOuFiWLk='

I am getting 405 as a response, I do not see any errors in my edx configuration. Is there some extra config I should add… Not sure where is the error.