Hide user from Skype for business online

[Deleted]

How do I hide user from being checked from Skype for business for cloud user and synced with AD user ? 

[#2]

Here are the bunch of options you can try .. see if they work for your scenario
1. "presence privacy mode" option
2. Creating OU without syncing with O365 Groups
3. In AD setting the value for msExchHideFromAddressLists

These options were discussed in this thread ...
https://techcommunity.microsoft.com/t5/Skype-for-Business-Users/Hide-User-from-Skype-for-Business-On...

let me know if this helps!