Are you using beta versions of Signal?
https://lemm.ee/post/3267163
Are you using beta versions of Signal? - lemm.ee
I just want to be able to regulate the vibration intensity or pattern. Signal vs. Snapchat for instance. Quiet ish vibes vs. an earthquake. I think they had that feature a long time ago in android 7 or something like that.
Maybe you should change system wide intensity setting or keyboard setting?