Can't push to an orgaization after repo transfer

I recently transferred a repoistory to an organization, which I created. I was able to push and read from the repository beforehand, but now it just complains about my permissions:

ERROR: Permission to slam-engine/slam-engine.git denied to jammehcow.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

Note that I own the organization. It doesn’t happen with any of my other orgs and I can push to my user repos, but not this. Tried cloning it fresh, using HTTPS & deleting the GitHub repo only to recreate it - but to no avail.

Does anyone have any ideas on this?

Please contact private support at https://github.com/contact. They’ll be able to take a look at your organization’s settings to help determine what might be at issue here.

Thanks!