Hi @Meadows, E , yes you heard it right, and this has came up before here:
sharing IR between ADF and Purview

Meadows, E
21
Reputation points
We currently support a platform with multiple instances. Each instance has an ADF with its own set of firewall rules for that instances Integration Runtime.
As we have a central instance of purview which will be connecting to multiple instances of ADF. We would like to use the IR of the ADF instances in Purview instead of having to duplicate all the Firewall rules again.
I have been informed by MS support this is not supported as yet but to raise a feature request here