Powershell script to create shared mailbox and E1/E3 User in hybrid

Question

Hi,

I'm trying to write an powershell script to create shared mailbox and new user account with E1 or E3 lic

Shared Mailbox Requirement

• Create new shared mailbox in office 365 - Need to check make sure shared mailbox doesn't existed
• Create new security group - Need to make sure Security group doesn't existed before creating
• Assign Full access/Send as permission for the security group above

New-RemoteMailbox -Shared -Name "SharedMailbox1" `
    -UserPrincipalName "SharedMailbox1@domian.com" -OnPremisesOrganizationalUnit "OU=Shared,OU=Company,DC=local" `
    -RemoteRoutingAddress "SharedMailbox1@domain.mail.onmicrosoft.com"