Unable to access Azure tenant

When attempting to access my azure instance, I receive the following error.

This occurred after converting the only user in entra from an external user to an internal user.

I cannot raise a support request as I cannot access the tenant. What other options do I have for support?

Thanks for any help.

{
  "sessionId": "xxx",
  "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 xxx;(Microsoft_AAD_UsersAndTenants) 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: d510bf1d-839e-42f3-b5b8-a6978107ea00 Correlation ID: 8295fa7a-249f-4569-9363-634784977a6d Timestamp: 2025-08-10 05:03:39Z",
      "clientId": "xxx",
      "scopes": [
        "https://graph.microsoft.com//.default"
      ]
    }
  ]
}