node-red projects feature does not work with github

[Deeds87]

Hi there,

i am not able to connect to a repository.

What i tried to do:

1. Installed a new instance of NodeRed @5.1.0
2. Created a NodeRed project
3. Generated a new ssh key with passphrase
4. Created an new repo
5. added the ssh key created in step 3
6. Added a remote connection in the NodeRed project ( ssh://git@github.com/username/nameOfTheRepo.git )
7. When i try to add the remote connection under history tab a authentication form will show up:
   7.1 I choose the correct ssh
   7.2 I entered my passphrase
8. The authentication form loops up to 5 times and disapears then
9. No connection to the remote repo

Nothing in the iobroker logs.
The browser console says: 400 Bad Request

If i do the same process on the same system with a standalone installation of Node Red (Not as a iobroker service) it runs like it should.

Any ideas?