I have deleted a branch locally using :

git branch -d (branch_name)

I then attempted to delete the remote branch using :

git push origin :(branch_name)

however that command gives me the following error :

_remote: permission denied to delete branch (branch_name)
To https://(my_account)@bitbucket.org/specialsource-ondemand/(repo).git\\
! [remote rejected] (branch_name) (pre-receive hook declined)
error: failed to push some refs to 'https://(my_account)@bitbucket.org/specialsource-ondemand/(repo).git'_

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Why am I unable to delete the branch at origin?
Am I doing something wrong?