All error codes

interface_limit_exceeded

HTTP 422 Maximum number of network interfaces reached

What happened

The server already has ten network interfaces, the maximum, so another one cannot be added. Server creation enforces the same ceiling under its own code, too_many_interfaces.

What to do

Delete an interface you no longer need, then send the request again with a NEW Idempotency-Key: this refusal is stored for a day against the key you used, and reusing it would replay the refusal rather than run the request.

Retrying

Fix the request and send it again.

How it arrives

{
    "type": "https://docs.fiberax.com/errors/interface_limit_exceeded",
    "title": "Maximum number of network interfaces reached",
    "status": 422,
    "code": "interface_limit_exceeded",
    "request_id": "a277dcd1ca652c65"
}

Branch your code on code, never on the wording of title.