Steps to Reproduce:

Does this issue occur when you try this locally?: Yes
Does this issue occur when you try this locally and all extensions are disabled?: Yes
Using the VScode insider V1.39.0 insider
Attempting to connect to a RedHat V7.6 server running on s390x. Get the following error upon connection. Add me to the list requesting this feature.

I have a requirement for this features as well.
Please add me to the list of users requesting this feature.
Please add support for s390x!
Unsupported architecture: s390x
Please add support for s390x.
Please add support for remotes that are s390x
Looking forward to s390x/Cp1047 support too.
Hi Guys,
i am trying this on Ubuntu 18.04 S390x, same Problem. Can you please add architecture s390x to the list of supported architectures for the vscode ssh extention? If you need access to a Linux running on S390x and you do not have access to an IBM Mainframe or LinuxONE System you could use the wonderful hercules emulator. z/Linux under hercules is not the fastest experience but it does work beautifully. Be aware that as of this writing Ubuntu 20.04 does not work under hercules though. You need to use 18.04. You can download an installation image from here. There are some great youtube videos on how to set this up, for example this one and a more specific video about networking issues can be found here.
thanks in advance and greetings from germany
Actually, if you need to access a real Linux on Z (s390x) system, you can request a VM from LinuxONE Community Cloud for developers. You can sign up from here.
Most helpful comment
Please add support for s390x!
Unsupported architecture: s390x