AADSTS16000

Question

自分のmicrosoftアカウントでazureのentra idのページに移動すると、以下のエラーが出ます。新しく別のアカウントを作っても同じテナントに所属させられている状態になって全く同じエラーが出ます。どうすればよいでしょうか？

{
  "sessionId": "2e6bff16edf1428691bce57569a0b4b9",
  "errors": [
    {
      "errorMessage": "interaction_required: AADSTS16000: User account '{EUII Hidden}' from identity provider 'live.com' does not exist in tenant 'Microsoft Services' and cannot access the application '74658136-14ec-4630-ad9b-26e160ff0fc6'(ADIbizaUX) in that tenant. The account needs to be added as an external user in the tenant first. Sign out and sign in again with a different Azure Active Directory user account. Trace ID: 7d2b2a87-0bce-41d8-8167-cc9aa27f1a00 Correlation ID: f6946607-6967-4097-98ec-cda6c938a593 Timestamp: 2025-10-01 02:48:57Z",
      "clientId": "74658136-14ec-4630-ad9b-26e160ff0fc6",
      "scopes": [
        "a57aca87-cbc0-4f3c-8b9e-dc095fdc8978/.default"
      ]
    }
  ]
}

Answer 1

This error usually occurs when a personal Microsoft account (MSA) is used to access a work or organizational tenant that it hasn't been invited to. Your personal account (e.g., Hotmail, Outlook) is trying to access an Azure AD tenant (like Microsoft Services) that it doesn't belong to.
Since it's not registered as a guest user in that tenant, access is denied. You can try to use a work or school account that is part of the target tenant. If you’re trying to access an enterprise application like ADIbizaUX, ensure you're using the correct organizational credentials.
Alternatively, Invite your personal account as a guest If you must use your personal account. The  Global Administrator of the tenant has the ability to invite your personal account as a guest user. Once invited, accept the invitation via email. You may then be granted access to the application.

Here is the documentation that is relevant https://learn.microsoft.com/en-us/azure/active-directory/external-identities/add-users-administrato…

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