Push my local branch to a new one on eclipse papyrus Github

***Getting error when traying to push my local branch to eclipse ***

I created my new local branch, I committed my changes, then when trying to push my branch using this command on cygwin
git push origin localbranchname:localbranchname
I got this error
remote:

remote: ========================================================================

remote:

remote: You are not allowed to push code to this project.

remote:

remote: ========================================================================

remote:

fatal: Could not read from remote repository.

my remote repository is
origin git@gitlab.eclipse.org:eclipse/papyrus/papyrus-website.git (fetch)
origin git@gitlab.eclipse.org:eclipse/papyrus/papyrus-website.git (push)
I have an SSH key and the public key is on github
am I missing some configuration?