No, we never got it working.
The old comments block doesn’t work with ClickUp as a data source (I don’t know about any other data sources).
They have introduced a New Comments block - it’s very good BUT the notifications don’t work for us for our use case (you can see more about it on this thread - Big upgrade: Comments just got a whole lot better) so it isn’t useable for us in its current format. They are currently working on the notifications feature but I don’t know how long this will be.
In the meantime (because we ran out of time with our clients), we invested in Intercom as a chat feature, it’s excellent and does what we need.
Hopefully the New Comments block will have an improved notifications feature in the future and then 2-way communication will be possible 
Hope that helps 