How do I fix insufficient permissions error during push?

[Christopher Hamilton]

When I try to push commits through Sourcetree I get this error:

fatal: remote error: Insufficient permissions
You cannot push to PF/test_hamilton. Pushing requires write access and your
access is read-only.
fatal: Could not read from remote repository.

However I am able to push using any other means (powershell, git bash, visual studio). In other words, I just have to click the terminal button and type 'git push' as a workaround.

I am also able to push using Sourcetree on my laptop, but not on my remote desktop. remote desktop is located in a secure data server (Again pushes work through other programs here).

I am pushing to a bitbucket server using ssh.

My .ssh folders are identical between machines. The folder contains id_rsa, id_rsa.pub (generated with openssh) and known_hosts. I've tried converting the private key to .ppk using PuTTY but it did not solve the issue.

My Sourcetree settings are identical under Tools > Options.

My Laptop is using Windows 10 while my RDP is Windows Server 2016. Both versions of sourcetree are the most recent.