git push feature/prizeFulfilment: feature/Prizefulfilment
That is similar to this answer:
For the record, I believe the root cause of this problem was the difference in capitalisation between the local and remote branch names, and the case-insensitive nature of the Windows share that hosted the remote repository.
We just encountered this exact same error and were able to resolve the problem simply by renaming the local branch to match the capitalisation of the existing remote branch.
Try and make sure to use the same capitalization between local and remote branches.
You second command make the link between the prizeFulfilment and remote Prizefulfilment explicit, which is why it worked. But it isn’t a good solution to keep a local branch with that kind of difference.