This may be a stupid or bad suggestion- but thought I'd throw it out there. This was my first forum- so Im certainly no expert from that end AND I try to avoid Facebook like I try to avoid Walmart, so I know less about Facebook than I do forums:).
I am not familiar "Discord" and such so that may be a better solution.
That said. I know you can create a Facebook group that is "secret" in that it can only be seen by its members. (The community we live in has one.)
The page could be linked here. And of course there is Facebook messenger. So, it occurred to me- if the powers that be wanted to and folks were interested, a Facebook group could be created and the chat type function there could be used in lieu of our missing chat piece.
For those very concerned with anonymity- It is super easy to make a pseudonym FB page for individuals by the way- I started one years ago that I thought I would use to socialize with other witches. All you need is an email that is different than the one you use for your public/main profile. (I never ended up using mine - but it still exists under the name Rhiannon Ravenwood- LOL!.)
Anyway- just a thought- I am sure the more tech savvy here will come up with something better.