With the lastest Beta release (2019.04.29.0505) Your router can't be discovered.
Enable port forwarding for TCP port 8089 manually. Where as before there was no problem.
2019/05/01 15:07:24 [NAT] Failed to discover upnp: write udp4 0.0.0.0:62672->239.255.255.250:1900: i/o timeout 2019/05/01 15:07:24 [NAT] Failed to discover router using natpmp and upnp. 2019/05/01 15:10:25 [NAT] Failed to discover upnp: write udp4 0.0.0.0:51573->239.255.255.250:1900: i/o timeout 2019/05/01 15:10:25 [NAT] Failed to discover router using natpmp and upnp. 2019/05/01 15:14:08 [NAT] Failed to discover upnp: write udp4 0.0.0.0:51701->239.255.255.250:1900: i/o timeout 2019/05/01 15:14:08 [NAT] Failed to discover router using natpmp and upnp.