API Call Network.Set error

[coolsport00]

When attempting to change MTU on one of my Host NICs (HBA) from 1500 > 9000, I received the below error (raw log):

"{
  "id": "0m936bdze",
  "properties": {
    "method": "network.set",
    "params": {
      "mtu": 9000,
      "id": "aadad118-1455-f063-7c35-7a4b709e4254"
    },
    "name": "API call: network.set",
    "userId": "dd12cef8-919e-4ab7-97ae-75253331c84f",
    "type": "api.call"
  },
  "start": 1743794658698,
  "status": "failure",
  "updatedAt": 1743794668793,
  "end": 1743794668793,
  "result": {
    "message": "Some network interfaces could not be updated.",
    "name": "Error",
    "stack": "Error: Some network interfaces could not be updated.\n    at Xapi.setMtu (file:///opt/xo/xo-builds/xen-orchestra-202504020942/@xen-orchestra/xapi/network.mjs:78:13)"
  }
}"

Although...when I look at the MTU in the Host (or Pool) Network tab, it shows it changed. Changing for another NIC/HBA I use for SAN iSCSI storage worked and showed a green check (success). But for this NIC, though showing as changed, I got this error. This particular NIC is used for Mgmt when I initially configured XCP. (v8.3 btw). Interestingly enough, another default Network using this same eth did allow me to change the MTU. So, it appears the issue is the Network, not the pNIC (PIF). Thoughts? Could it be changing MTU on the Mgmt Network isn't allowed after the Host is built?
Thanks.