When i click on minecraft realms appears that message "An error occurred (401): Client not supported". I don't know if that was expected but i'm publishing that for if not.
Environment
os_name: Windows 8.1
os_version: 6.3
os_architecture: x86
opengl_vendor: NVIDIA Corporation
opengl_version: 4.4.0
launched_version: 14w29b
client_brand: vanilla
cpu_cores: 8
You're running a snapshot, which is not supported by Realms. Realms always supports the latest official release (1.7.10). MC-55554