We have a new communication channel. There is now a dedicated chat room on matrix.org for all topics related to DUNE. You can join the room via this link, or get somebody to invite you.
Matrix is an open federated protocol for real-time communication. Many institutions provide their staff with a matrix identity nowadays. If your institution is not on the list, ask them for a matrix homeserver. While you wait, you can get free accounts from (e.g.) matrix.org.