If you have changed your certificate of your git repository, you will receive the following error message.
fatal: Authentication failed for for 'https://bitbucket.*****/***/usermgt*.git/'
You can follow following steps to resolve the issue.
1. Retrieve the remote URL
git remote -v
2. Remove the remote URL
git remote rm origin
3. Add URL as new remote URL
git remote add origin https://bitbucket.*****/***/usermgt*.git
4. Make changes and push
git push origin master
