Be careful of the initial step to set the initial state of the weather. You need to choose CUSTOM WEATHER, and set it to clear. You can’t just select the clear weather preset from the top right corner of the screen. That doesn’t work. Once you set that initial to clear, every new flight you enter will be clear weather. Then you use the weather preset in sim to change to Live Weather.
Obviously this doesn’t work if you’re using Live Players since it locks everyone to the same weather and time of day (supposedly). But you can do it if you select All Players for your multiplayer mode.
Many people who it “didn’t work” for just didn’t set the initial weather right.