I think Atlassian is trying to prevent the same sort of thing as trying to delete a branch that has unmerged commits, in that if the account/password is actively used in any of your repositories, the UI won't let you delete it as that *could* permanently remove access if the password was forgotten.

So how do you do a **`--force` delete**?

1. First close any open instances of SourceTree
2. As [Pathfinder][1], pointed out, SourceTree stores some of the passwords using the **Windows Credential Manager**

 1.  Go to Control Panel > User Accounts > Manage Credentials > Windows Credentials
 2.  Find any offending passwords and remove them

      [![Windows Credential Manager][2]][3]

3. SourceTree *also* stores passwords in you Local App Data Folder in a passwd file:
 1. Open Windows Explorer (<kbd>⊞ Win</kbd>+<kbd>E</kbd>)
 2. In the address bar, go to `%LocalAppData%/Atlassian`
 3. Open the Source Tree Folder and delete the only account+pasword rows or if required delete the all accounts or delete the complete `passwd` file 

      [![Delete Local File][4]][4]
4. Open Source Tree and **Perform a Fetch** before doing anything else. 

**Further Reading**:

* [Cannot delete an account in SourceTree][5]
* [Still unable to delete REST Saved Passwords?][6]
* [How to update HTTP(S) credentials in SourceTree][7]


  [1]: https://stackoverflow.com/a/49300637/1366033
  [2]: https://i.stack.imgur.com/IBBxc.png
  [3]: https://i.stack.imgur.com/MlFbc.png
  [4]: https://i.stack.imgur.com/7Y1BM.png
  [5]: https://community.atlassian.com/t5/Sourcetree-questions/Cannot-delete-an-account-on-sourcetree/qaq-p/602672
  [6]: https://community.atlassian.com/t5/Sourcetree-questions/Still-unable-to-delete-REST-Saved-Passwords-in-Tools-Options/qaq-p/694831
  [7]: https://community.atlassian.com/t5/Sourcetree-questions/How-to-update-HTTP-S-credentials-in-sourcetree/qaq-p/297564

I am in the process of deleting an account on my source tree, but whenever I attempt to delete in:

    

> Tools > Options > Authentication

[SourceTree][1] doesn't delete the saved password. I need to delete the password as it has the incorrect details associated with the account.

OS: Windows 10

Version: 2.1.2.5


  [1]: https://www.sourcetreeapp.com/