This says you can: https://www.callofduty.com/warzone/strategyguide/welcome-to-the-warzone/WarzoneFAQ
10. What are my crossplay options? Can I disable it?
Crossplay is enabled by default. However, if you only want to play with other players on your current platform, you can choose to disable crossplay.
1. Go to the Options menu.
2. Navigate to the Account tab.
3. Toggle the Crossplay option to Disabled.
On the Account tab, you can also choose to enable or disable text and voice chat with players on other platforms.
I was trying to be helpful, not picky.
Looks like the # symbol makes a header. https://daringfireball.net/projects/markdown/syntax#header
You can use just a number and a period at the beginning of your line to make a numbered list.
I would try reinstalling the Ubisoft Connect client from the website to ensure you installed the correct version when you installed from Epic. If you still have issues, reach out to [Ubisoft Support](support.ubi.com/Cases/New) so the team can investigate it for you!