UPDATE 12/12/18: It looks like Ashen's PC multiplayer woes are over, as A44 Games has announced the issues plaguing the game since launch have now been fixed.
A new patch is currently available to download from the Epic Games Store, and should help resolve the connection issues experienced by players over the past few days. Along with the update, A44 Games has also created an FAQ page to help players navigate the game's multiplayer elements, many of which had been causing confusion.
Although it took them a few days to figure it out, A44 Games has at least been pretty good at keeping players updated on the situation. The developer thanked the community for their patience and Epic for their support in issuing the fix. Hopefully A44 Games won't have to keep putting out fires in Ashen any time soon.