Restore Shared Mailboxes

In order to restore shared mailboxes, you have to connect through powershell. Here is a page that describes how to connect

https://docs.microsoft.com/en-us/powershell/exchange/connect-to-exchange-online-powershell?redirectedfrom=MSDN&view=exchange-ps

Basically 2 commands as long as the module is installed:

Import-Module ExchangeOnlineManagement

Connect-ExchangeOnline -UserPrincipalName adminuser@domain.com

Then, to restore the box

Undo-SoftDeletedMailbox -SoftDeletedObject boxtorestore@domain.com

Disconnect from EOL in powershell when done

Disconnect-ExchangeOnline