def by_mailbox_protection_unit_id(self,mailbox_protection_unit_id: str) -> MailboxProtectionUnitItemRequestBuilder:
        """
        Provides operations to manage the mailboxProtectionUnits property of the microsoft.graph.exchangeProtectionPolicy entity.
        param mailbox_protection_unit_id: The unique identifier of mailboxProtectionUnit
        Returns: MailboxProtectionUnitItemRequestBuilder
        """
        if mailbox_protection_unit_id is None:
            raise TypeError("mailbox_protection_unit_id cannot be null.")
        from .item.mailbox_protection_unit_item_request_builder import MailboxProtectionUnitItemRequestBuilder

        url_tpl_params = get_path_parameters(self.path_parameters)
        url_tpl_params["mailboxProtectionUnit%2Did"] = mailbox_protection_unit_id
        return MailboxProtectionUnitItemRequestBuilder(self.request_adapter, url_tpl_params)

        Provides operations to manage the mailboxProtectionUnits property of the microsoft.graph.exchangeProtectionPolicy entity.
        param mailbox_protection_unit_id: The unique identifier of mailboxProtectionUnit
        Returns: MailboxProtectionUnitItemRequestBuilder
        
msgraph/generated/solutions/backup_restore/exchange_protection_policies/item/mailbox_protection_units/mailbox_protection_units_request_builder.py