I have a Windows laptop that consistently gives "Invalid session id" when trying to authenticate with Realms server (when accessing "Minecraft Realms" from the menu, or "Multiplayer" when servers are in online-mode=true).

The error seems to happen only on one laptop. I can access Realms and Multiplayer on another machine using my account. This has been happening for over a year - since version 1.9. I have logged out. Re-installed. Restarted. This occurred with the old launcher and continues after installing the new launcher. I have re-installed Java.

See REALMS-45 and other related issues. (They were closed with no actual resolution.)

[0214/194701:INFO:GameCallbacks.cpp(186)] game/com.mojang.realmsclient.client.RealmsClient (Realms Notification Availability checker #1) info Could not authorize you against Realms server: Invalid session id

Any ideas would be appreciated!
Thanks!