Cloning an Azure Devops Repo

[Denir]

I am trying to Clone a Repo from Azure Devops (which I have already added the account for with a PAT). When I attempt to Clone it I am provided a "This is not a valid source path".

The main standout line in the error details is:

Error: fatal: Authentication failed for 'https://dev.azure.com/[Organisation]/Internal%20Documents/_git/Internal%20Documents/'

I have limited experiece with repository systesms and have mainly used SourceTree or TortoiseSVN in the past. Sourcetree is updated to the most recent version. I would appreciate any insight into this process.