I cannot access my Azure SMB file share as either an internal or external users (I've granted access through I AM to the external user)

Hi Steve Gray,

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I'm glad that issue is resolved by you and confirmed via Private message.

• Please verify the following configuration and access points to ensure Azure Files SMB access is functioning correctly:
  1. SMB Access & Authentication Setup
     • Confirm that Azure Files SMB access is enabled on the storage account.
     • Ensure that either Active Directory Domain Services (AD DS) or Azure AD Kerberos authentication is properly configured and linked to the storage account.
  2. Conditional Access Policies
     • Check that no Conditional Access policies (such as MFA enforcement or compliant device requirements) are blocking SMB logins for Entra ID–based authentication.
  3. External (B2B) User Access
     • Verify that external (B2B) users have been invited to and have accepted the invitation in your Entra ID tenant.
     • Ensure that the appropriate Azure RBAC roles — such as Storage File Data SMB Share Reader or Storage File Data SMB Share Contributor — are assigned at the share or storage account level.
  4. Network Connectivity
     • Confirm that TCP ports 445 (SMB) and 443 (HTTPS) are open for outbound traffic on your local network and firewall.
     • Be aware that some ISPs and corporate networks block port 445, which can prevent SMB access.

Hope this helps!

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