Error trying to verify a tweepy API using 3 legged OAuth. Error 401

I am trying to use twitter's 3-legged OAuth to tweet using a twitter bot that I made, on a different twitter account. After going through the tweepy documentation (https://docs.tweepy.org/en/stable/authentication.html#legged-oauth) for 3-legged OAuth, I ended up with the following code:

import tweepy    

consumer_key = 'XMNB5a0cuHOrko2ETCqs8iT4p'
consumer_secret = 'm46XTiR9JkYXWEoHWZwyemQJ5V5JW448KzovQWnpWNglTVUmjz'
callback_url = 'http://127.0.0.1/'


oauth1_user_handler = tweepy.OAuth1UserHandler(
    consumer_key, consumer_secret,
    callback= callback_url
)

print(oauth1_user_handler.get_authorization_url())

After printing the URL to grant the bot access to my other twitter account, the website redir http://127.0.0.1/?oauth_token=IsmSagAAAAABhOTpAAABg2xaxX4&oauth_verifier=QK7sVI3A8i0wsUR59s4MiGPMFJejzWcr

 access_token, access_token_secret = oauth1_user_handler.get_access_token(
    'QK7sVI3A8i0wsUR59s4MiGPMFJejzWcr'
)

Next I passed the end of the URL into this portion of the code, where it asks for the OAuth Verifier. When I run this, I get an error.

"raise TweepyException(e)

tweepy.errors.TweepyException: Token request failed with code 401, response was 'Error processing your OAuth request: Invalid oauth_verifier parameter'."

I'm not sure what I am doing wrong here or what the issue. If anyone has an experience with this or 3-legged OAuth or any other suggestions on how to tweet on a different account, any help would be greatly appreciated, thanks!