Authentication Failed for Git push to Azure

• Looks like remote with the name azure already exists on your system and that remote contains the url "https://***.scm.azurewebsites.net/.git".

• The error message says that, The remote already exists.

• You are trying to add a remote called "azure" that it already exists in your configuration.

• Add a new remote with new name like "newazure" with it's URL as you want.

• Follow the below command to add new:-

git remote add newazure https://***.scm.azurewebsites.net/***.git

OR

• Remove the remote azure first, then add again with the path.

$ git remote rm azure
$ git remote add azure <repo-url> 

Another way:
Set the azure's url instead of adding.

$ git remote set-url azure <repo-url>