Had this issue happen to me since I started using FS traffic this month and the only thing that worked for me was the following:
Select destination in MSFS
Click on FS traffic from the toolbar and wait until it populates the destination, then click confirm
Wait a few seconds then close the pop up
I think a lot of people in this forum said these steps would work but have seen others say it didn’t work, so just sharing my own experience here.
Now I need to figure out how to reduce traffic at arrival (lol) as I couldn’t land in one out of two times due to excessive traffic (one plane approaching with me and one on the runway sayintentions ATC cleared me to land on)