I am using Postman and l3FirewallRules work fine.
I removed my key and shorten the network ID
GET /api/v0/networks/N_6558366957/l7FirewallRules HTTP/1.1
Open a ticket with TAC.
There is a patch that they will need to add to the Org. they said to open a ticket for each ORG?
Thats going to be a lot of ticket.