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This worked for me.  You have to do Steps 8 and 9.

I've got two remote macs both on Mojave 10.14 where I can not use the host keyboard / mouse to control the remotes.  Host is also 10.14 Mojave.  I've uninstalled the remote agent, rebooted, and reinstalled and granted all of the recommended permissions, with no success.   I hope there is a fix soon.