Hey,
It seems Dynmap is down. I really enjoyed this feature as it allowed me to talk to players on my phone without Minechat (If thats still a thing). If this wasn't taken down on purpose, can this feature be added back sometime?
~Zbro
The older versions of dynmap aren't compatible with 1.13, so we have to wait for it to be updated. The developer said that he thinks he will have a working build out sometime soon, however it might take longer for a stable version to be released
You can also chat with people in game through discord now, so check that out.