FC multipath issues

Description

I need assistance with an FC issue between a proxmox VE v7.2-1 host using multipath and an IBM v3700 storage. The storage only sees a single path to the host.
There doesn’t appear to be a physical issue anywhere + the fibre ports on the FC switch (brocade G610) appear to be up.
There wasn’t any config / physical changes made, though on the 17.5.23 there was a power outage in the Datacenter and at the very least, the FC switches which have a single PSU, rebooted one after the other. I do have a config backup + config revision management on the switches so I can see that no config was lost at the reboot.

I need someone who is proficient with both Linux / proxmox multipath config, IBM v3700 storage and Brocade FC switches.