I'm having the exact same issue:
root@server1:~# doveadm sync -u username remote:server2
dsync-server: invalid option -- 'U'
Error: doveadm: Unexpected or incomplete option: -U
dsync-local(username)<DhyOCo4H2GhtOAcAMnEMxw>: Error:
read(192.168.109.2) failed: EOF (version not received)
dsync-local(username)<DhyOCo4H2GhtOAcAMnEMxw>: Error: cmd sync: Remote
command returned error 64: ssh server2 doveadm dsync-server -uusername -U
Looks like doveadm sync is executing dsync-local on the remote server,
while passing an unsupported -U command. This started happening when I
upgraded my 1st server from 2.3. I reversed the replication direction,
and convinced myself it was working, but after upgrading the last
server, they can't replicate in either direction.
--
Pete Greening
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