I've been having no success with engaging a remote keyboard on a connection. At first, I thought I kind of put it off thinking it must be due to my remote computers but I've isolated this behavior to the following conditions.
1. Mac OS 10.14 (Mojave) fully updated.
2. LogMeIn Central version 126.96.36.19995 running on the Mac referenced above.
3. The setup is on another co-worker and he has the same environments and has the same issues.
Currently, my workaround is to pull my other computer Surface or Windows or my desktop iMac (10.13.6) running the same LogMeIn Central client version as stated in #2 the connection enables/engages the remote keyboard successfully. It has been several weeks and so I finally opened a support case with LogMeIn.