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--- course:office_365:start [2017/06/18 19:27] – don.lee
+++ course:office_365:start [2025/01/03 13:19] (current) – don.lee
@@ Line 1: / Line 1: @@
-====== Office 365 ======
+====== Microsoft 365 ======
+===== Remove blocked users from the Restricted entities page =====
+  * https://learn.microsoft.com/en-us/defender-office-365/outbound-spam-restore-restricted-users
+===== First Time Login =====
+  * [[course:office_365:first time login:|First Time Login]]
+===== Important =====
+  * [[course:office_365:enable two factor authentication:|Enable two factor authentication]]
+===== General =====
+  * [[course:office_365:check production key:|Check installed Product Key]]
   * [[course:office 365:outlook setup:|Setup Office 365 Email in Outlook]]
   * [[course:office 365:add new mailbox:|Add new mailbox]]
   * [[course:office 365:DNS:|Using Office 365 DNS]]
   * Setup a Catch All email
-    * http://www.yourithelp.co.uk/office-365-create-catchall-wildcard-address-office-365/
+    * http://o365info.com/configuring-catch-all-mailbox-in-office-365-part-1-of-2-2/
+    * https://o365info.com/configuring-catch-all-mailbox-in-office-365-part-2-of-2-2/
     * https://social.technet.microsoft.com/wiki/contents/articles/30462.catch-all-mailbox-office365.aspx
+  * [[course:office_365:disable password expiry:|Disable Password Expiry]]
+  * [[course:office_365:allow user send as alias:|Allow user send as alias]]
+===== Troubleshooting =====
+==== invalid sender ====
+<note warning>Your message couldn't be delivered because you weren't recognized as a valid sender. The most common reason for this is that your email address is suspected of sending spam and it's no longer allowed to send email. Contact your email admin for assistance.</note>
+Reference: https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/removing-user-from-restricted-users-portal-after-spam?view=o365-worldwide
+  * login office 365 admin portal
+  * go to Microsoft 365 security at https://security.microsoft.com/restrictedusers
+    * if there is any user blocked, select it and click [Unblock]
+    * it may take an hour to be effective
+==== Enable-OrganizationCustomization ====
+<note important>The command you tried to run isn't currently allowed in your organization. To run this command, you first need to run the command: Enable-OrganizationCustomization.</note>
+Need to connect to M365 via PowerShell to enable it. It will take some times (1 hour) to be ready. Then you could go back to the GUI to setup.
+https://docs.microsoft.com/en-us/powershell/exchange/connect-to-exchange-online-powershell?view=exchange-ps
+Connect M365 via PowerShell
+  * Run Windows PowerShell as Administrator
+  * connect to your M365 with this command, replace navin@contoso.com with your username
+<code>
+PS C:\Windows\system32> Import-Module ExchangeOnlineManagement
+PS C:\Windows\system32> Connect-ExchangeOnline -UserPrincipalName navin@contoso.com
+</code>
+  * Run Enable-OrganizationCustomization
+<code>
+PS C:\Windows\system32> Enable-OrganizationCustomization
+</code>
+The output may display "This operation is not required. Organization is already enabled for customization.". It is okay and just wait an hour for it to be completed.