How to add a shared mailbox on o365 without a password

There are two options.

Option 1:

Use the BULK ADD option.

 

Option 2:

Authenticating a shared ‘unlicensed’ mailbox

Step1. Logon to Microsoft Office 365 as your tenant admin to https://portal.office.com/

 

Step2. Navigate to the ‘Users’ section and click on Active Users. Note: do not go to groups > shared mailboxes as the password option is not available in that section). https://admin.microsoft.com/AdminPortal/Home#/users

 

Step3. Select the shared ‘unlicensed’ mailbox from the list. Hover over your shared mailbox and click the key icon that appears.

Alternatively, click on your shared mailbox and click “reset password” on the next screen.

 

Step 4. Press re-set password

 

Step 5. Specify a password.

 

Step6. Leaving the Office 365 portal in a new tab open up timetoreply and navigate to the agents page: https://portal.timetoreply.com/tools/agents

 

Step7. Press Add Agent/Add Another

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Step8. Give the mailbox a friendly display name, specify the mailbox email address and Office 365 as the service type, and press send invite.

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Step9. Navigate to the agents / mailboxes section under tools https://portal.timetoreply.com/tools/agents

 

Step10. Press view current authentication link

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Step11. Visit this link and sign in as the shared mailbox using the details you created earlier.