With 10.14 Beta (18A336e), we cannot connect to remote Macs with Screen Sharing over LAN or WAN. The password is rejected by the remote machine. However, all other Macs in our office running Sierra can connect to the same remote machines using the the same credentials and password. It's only the Mojave beta that can't connect.
The password is also not stored to the keychain, but this may be because the connection is unsucessful.
Anyone else having this issue?