Currently, there is no way to link AzureAD users to Helpdesk tickets in Lansweeper 10.6.0.0 on-premise. However, here is a workaround that you can try.
1- In Lansweeper, go to Configuration > User Access & Roles.
2- Click the Add button and select Active Directory or Workgroup user.
3- Enter the email address of the AzureAD user that you want to link to Helpdesk tickets.
4- Click the Save button.
Once you have added the AzureAD user to Lansweeper, they will be available as a "User concerning" or "CC user" when creating a new Helpdesk ticket.