Put the summary of the bug you're having here
What I expected to happen was...:
Clicked icon to load Minecraft on PC
What actually happened was...:
New launcher installed, I clicked on Realms. Received message "Invalid Session".
Steps to Reproduce:
1. Click icon to load Minecraft.
2. Click Play
3. Click Realms
4. Receive error message.
I have tried several times and continue to receive the error message.