[Python] Bad request while accessing the Authorization URL for PRAW Reddit API wrapper

I'm trying to Authenticate via OAuth using Code Flow method for my python script. while do so, I'm getting following message while accessing the obtained authorization url - "bad request (reddit.com) you sent an invalid request — that option is not valid."

Here is my code: reddit_OAuth2.py

class OAuthRedditAccess():
def __init__(self, client_id, client_secret, user_agent, redirect_url):
self.user_agent = user_agent
self.client_id = client_id
self.client_secret = client_secret
self.redirect_url = redirect_url

reddit_read_only = praw.Reddit(client_id=self.client_id, client_secret=self.client_secret, user_agent=self.user_agent)
print("read only client instatiated.")


def OAuth2(self):
reddit = praw.Reddit(client_id=self.client_id,
client_secret=self.client_secret,redirect_uri=self.redirect_url, user_agent=self.user_agent)
_auth_url = reddit.auth.url(scopes=["identity"], state="...", duration="permanent")
print("Authorization url is ",_auth_url)


main.py

if __name__ == '__main__':
user_agent = "scriptroducer_reddit_api:v1.0 (by /u/my_id)"
redirect_url = "http://localhost:8080"
client_id = os.environ.get("client_id")
client_secret = os.environ.get("client_secret")

OAuth_obj = OAuthRedditAccess(client_id, client_secret, user_agent, redirect_url)
OAuth_obj.OAuth2()


Articles I'm referring to: https://praw.readthedocs.io/en/stable/getting_started/authentication.html https://praw.readthedocs.io/en/stable/getting_started/configuration/environment_variables.html

Note: My client_id and client_secret are correct as i've validated using below code and it gives me correct username

reddit = praw.Reddit(
client_id = <my_client_id>,
client_secret=<my_secret_id>,
password=<password+2FA_auth_code>,
user_agent = "scriptroducer_reddit_api:v1.0 (by /u/my_id)",
username=<my_username>)

print(reddit.user.me())

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