Test version 1.12 -> 1.16.5

test done on the version of the launcher provided at purchase and on the version before.

The Microsoft account does not see the LAN games on the launcher provided at the time of purchase.
The old launcher sees the local (LAN) game and accesses them (with the Microsoft account)

Windows' Firewall set to allow Java on private network.

Xbox is allowed too

Java is up to date

Acces path for the 2 launcher added