since laste update (2020-08-24), I can not get any lobbies. Sometimes, There are only 1 or 2 lobbies availables in the lobbies browser. Cross platform option is checked. I dont know why I cant see everyone as before. My version is 101.101.39515.0.0.
There is a new update available, so most people in the mulitplayer lobbies are using that version. The latest patch is version 40220, you are still using 39515. See: https://www.ageofempires.com/news/aoe2de-update-40220/
After updating, you should see a lot more lobbies.