Same thing here. It worked at our LAN party in May. This time we were forced to update and it seems to have broken the LAN party. It worked when we set it up as a public game but I had to boot players until all the LAN party players got in. Not a good plan. This needs to be fixed.
Same thing here. It worked at our LAN party in May. This time we were forced to update and it seems to have broken the LAN party. It worked when we set it up as a public game but I had to boot players until all the LAN party players got in. Not a good plan. This needs to be fixed. I checked the firewall access and everything is checked. We are running the latest build from the Microsoft Store as of 12/14/2019.
I have the same issue with LAN multiplayer where the game lobby is empty running AoE DE build 28529 installed from the Windows Store.
As a test I temporarily disabled Windows Defender Firewall and this instantly solved the problem - now able to see, join and play LAN games. As the AoE executables are located in the protected WindowsApps folder I can not browse them and hence not add them in a new Windows Defender Firewall rule. So far I have not dared to modify the ACL (Access Control List) on the folde, to add sufficient rights to my user account.
Please advice on how to fix this so LAN plays are available again.
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Still the same problem with build 36211. I opened the FW with rules as explained in FAQ: no more luck.
Agree. Really poor from Microsoft here.
I am running with firewall completely disabled. Have no success seeing the lobby I set up on a LAN server. Disapointed.
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Any update here? The only way we can play on LAN now is to disable the Firewall on both computers. Even then we still experience quite a bit of lag. So much so that we canāt even play. When I give an instruction, it can take up to five minutes for it to go. Our internet is 1Gbps Fiber and we are playing over wired connections and sometimes Wifi 6(ax) on a new Surface Laptop 3. Not sure why this doesnāt work properly (or easily).
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Latest version (Build 38862) does not fix this issue nor it fixes the request of UAC at the beginning.
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I had the same issue on Age of Empires II: DE. I got it to work by adding firewall rules to allow incoming traffic on UDP port 9999 and TCP port 8888. It is actually only necessary to add TCP port 8888 to the computer hosting the game, and UDP port 9999 to the clients joining that game.
This is in addition to the predefined rule āAge of Empires II: Definitive Editionā that was added automatically during installation.
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Umeaa, Thank you!
Apparently, this issue is still here with version 40874 (Windows Store installation). Iāve created a LAN server, but the other computer on my home LAN couldnāt see/find it. I even tried to invite the other PC user to this server, but I got āR_NATFailureā error
I knew that it was some missing ports, since when disabling Windows Firewall on both PCs, it started working.
Iāve read several threads about it, with many suggestions about the ports that should be white-listed, none of them worked.
And then I saw your response, about just adding TCP 8888 and UDP 9999 - and it worked like a charm. So thank you for sharing it!
Iām curious - how did you find out that those two ports should be added to the firewall settings?
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Glad that I could help! Well, it was some trial and error, and a bit of luck. I think one of the ports I found listed somewhere, together with some other ports. But that didnāt work, so I started testing ranges of ports and realised that only one of the listed ports was needed, together with a range on the other protocol. It took some testing, but then I made guess, and was lucky 
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OMG. Thank You! Trying to play a local LAN game and wasted lots of time trying to solve.
Opening those ports on both systems fixed the issue of no being able to see games to join
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Year 2023 still having the same isse first I tried to add ports to both computers as suggested, not worked then I disable the windows firewall in both pc not worked. Both pc are connected to same network and conneced to internet. Shamefull Microsoft couldnt fix the issue after all those years.