Enable Admin Account In-Place Archive

Open your Office 365 account.

Then, click on the menu option from the left navigation bar.

After that, click on the Admin button.

Now, select the Show All button to see all options available.

Click on the Exchange option from the drop-down list.

In the next window appear, click on the Recipient option.

Now, select the admin account and check whether the in-place archive option is enabled or not.

If the option is disabled, click on the Enable button.