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Add new primary identifier; unverifiable identifier

given: "Alice" created an actor on "abel" called "Alice" with username "Alice"

send.Alice.request.create_actor
{
  "base_url": "http://abel",
  "preferred_username": "Alice",
  "profile": {},
  "automatically_accept_followers": null,
  "name": null
}
receive.Alice.response.create_actor
{
  "attachment": null,
  "published": "2026-03-20T15:18:44.921019",
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    "https://w3id.org/security/v1",
    {
      "manuallyApprovesFollowers": "as:manuallyApprovesFollowers"
    }
  ],
  "publicKey": {
    "id": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ#legacy-key-1",
    "owner": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ",
    "publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3VXjDEexhWCB+nF4yP2m\nTaz9H4fdMp1ZP5llpCY9mxdOzbEvPVhmEbgUMZFS8XYhyrK2pmlKIOe6mnqXAJvl\nVPWvApA6hcjfWfkcEdk54EMUdxpMbi9uUmRs0t1mHCwcw/ZyA2/EQh8zk/tPgGIV\nrMw6yO6trhU0O7T7Mh549MDXv0mQ/91L114Ub0+LpzE+/5P2T9VvCwrIiKJ5VIn6\nldIy9jm4t5KQn5lZr4G63Ok+NrDQdMie8kLcE35KMQa+UmC0GGrsqb5WrQO2YM27\nq1PYUrjZJONF7CcSR1Yg+7Af46+sNSSbErLVy05yhwlioMZnYYz517DDCLRP/wjw\n9wIDAQAB\n-----END PUBLIC KEY-----\n"
  },
  "id": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ",
  "type": "Person",
  "inbox": "http://abel/inbox/6x4yUcqXnYemXFTJQrumWA",
  "outbox": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ/outbox",
  "followers": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ/followers",
  "following": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ/following",
  "preferredUsername": "Alice",
  "name": "Alice",
  "identifiers": [
    "acct:Alice@abel",
    "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ"
  ],
  "endpoints": {
    "sharedInbox": "http://abel/shared_inbox"
  },
  "manuallyApprovesFollowers": true
}

given: "Alice" adds "acct:alex@unknown.test" as a primary identifier

send.Alice.trigger.update_actor
{
  "actor": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ",
  "profile": null,
  "autoFollow": null,
  "actions": [
    {
      "action": "create_identifier",
      "identifier": "acct:alex@unknown.test",
      "primary": true
    }
  ]
}

when: "Alice" retrieves the object with id "acct:Alice@abel"

send.Alice.request.fetch
{
  "actor": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ",
  "uri": "acct:Alice@abel"
}
receive.Alice.response.fetch
{
  "actor": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ",
  "uri": "acct:Alice@abel",
  "data": {
    "attachment": null,
    "published": "2026-03-20T15:18:44.921019",
    "@context": [
      "https://www.w3.org/ns/activitystreams",
      "https://w3id.org/security/v1",
      {
        "manuallyApprovesFollowers": "as:manuallyApprovesFollowers"
      }
    ],
    "publicKey": {
      "id": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ#legacy-key-1",
      "owner": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ",
      "publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3VXjDEexhWCB+nF4yP2m\nTaz9H4fdMp1ZP5llpCY9mxdOzbEvPVhmEbgUMZFS8XYhyrK2pmlKIOe6mnqXAJvl\nVPWvApA6hcjfWfkcEdk54EMUdxpMbi9uUmRs0t1mHCwcw/ZyA2/EQh8zk/tPgGIV\nrMw6yO6trhU0O7T7Mh549MDXv0mQ/91L114Ub0+LpzE+/5P2T9VvCwrIiKJ5VIn6\nldIy9jm4t5KQn5lZr4G63Ok+NrDQdMie8kLcE35KMQa+UmC0GGrsqb5WrQO2YM27\nq1PYUrjZJONF7CcSR1Yg+7Af46+sNSSbErLVy05yhwlioMZnYYz517DDCLRP/wjw\n9wIDAQAB\n-----END PUBLIC KEY-----\n"
    },
    "id": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ",
    "type": "Person",
    "inbox": "http://abel/inbox/6x4yUcqXnYemXFTJQrumWA",
    "outbox": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ/outbox",
    "followers": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ/followers",
    "following": "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ/following",
    "preferredUsername": "Alice",
    "name": "Alice",
    "identifiers": [
      "acct:Alice@abel",
      "http://abel/actor/iLfzloHEYiW4NQ-QruIKYQ"
    ],
    "endpoints": {
      "sharedInbox": "http://abel/shared_inbox"
    },
    "manuallyApprovesFollowers": true
  }
}

then: The preferred username is "Alice"

then: "acct:alex@unknown.test" is not contained in the identifiers array