I have a project running in 1.56.14540. I have uploaded changes a few times without issue in Remote Explorer, but this morning I am getting an error "Value cannot be null. Parameter name: privateKey".
It may or may not be related, I had a merge conflict this morning which was manually resolved through the Visual Studio Merge Editor. The conflict has been resolved and updates committed and pushed. Again, it may be unrelated, but that is the only other thing that is out of the ordinary.
Thanks for looking and let me know if there is more information that I can provide to help get this resolved.