Forbidden - Using Sourcetree as usual

Hello there,
since yesterday evening gitlab returns for me “Forbidden” and I am not allowed to pull or push to any of my repositories or the repositories of my coworker. As far as I can tell I haven’t done anything unusual other than normally pulling and pushing.
Is there any way to resolve this ban or get any more information about how or for how long this ban is active? Can I contact gitlab somehow to fix this issue?

Thanks in advance for any help

using ssh seems to work and there seems to be an authentification error with the LFS