MacBook Pro 2018 no haptic feedback OS Catalina
For my 2015 MBP, this happened immediately after upgrading to Catalina.

My MBP was no longer under warranty so going to apple wasn't an option.

What worked for me was:

"It just started working again a few days later"

Most of the advice I found elsewhere, and tried, was:


pram reset
power off and leave it off for a while
check for battery swelling 


my battery was swollen a year ago, when it was under warranty, and
Apple replaced a lot of things

send it in under warranty