Give delegated permissions 365 Powershell

Full access

Add-MailboxPermission -Identity <MailboxIdentity> -User <DelegateIdentity> -AccessRights FullAccess

Send as

Add-RecipientPermission -Identity <MailboxOrGroupIdentity> -Trustee <DelegateIdentity> -AccessRights SendAs

Send on behalf

Set-Mailbox -Identity <MailboxIdentity> -GrantSendOnBehalfTo <DelegateIdentity>

Verify

Get-Mailboxpermission -Identity <MailboxIdentity>

Remove Full access

Remove-MailboxPermission -Identity <MailboxIdentity> -User <DelegateIdentity> -AccessRights FullAccess

Remove Send as

Remove-RecipientPermission -Identity <MailboxIdentity> -User <DelegateIdentity> -AccessRights SendAs

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