Aug 26 23:53:14 wg-dyp2 pppd[9455]: The remote system is required to authenticate itself
Aug 26 23:53:14 wg-dyp2 pppd[9455]: but I couldn't find any suitable secret (password) for it to use to do so.
Aug 26 23:53:14 wg-dyp2 pppd[9455]: (None of the available passwords would let it use an IP address.)