All error codes

backup_policy_apply_failed

HTTP 503 The platform could not apply the backup policy

What happened

The platform did not finish applying the backup policy: after the write, the policy read back does not match what you asked for. On the project-level endpoint it means the new default was saved but some servers were not switched.

What to do

Read the policy back, then send the same request again a little later. Repeating it is safe and completes the servers that were missed.

Retrying

The request itself is fine. Repeat it later; after a 5xx use a new idempotency key and read the resource first.

How it arrives

{
    "type": "https://docs.fiberax.com/errors/backup_policy_apply_failed",
    "title": "The platform could not apply the backup policy",
    "status": 503,
    "code": "backup_policy_apply_failed",
    "request_id": "a277dcd1ca652c65"
}

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