Hi,

In Odoo 17 Community, only internal notifications are sent by default for time off requests.

You can send an email to the manager using Automated Actions.

Turn on Developer Mode.

Go to Settings > Technical > Automated Actions > Create.

Set:

    Model: Time Off (hr.leave)

    Trigger: On Creation or On Update

    Domain: [('state','=','confirm')] (when leave is submitted)

    Action To Do: Send Email

Create or link an Email Template:

    To (Emails): {{object.employee_id.parent_id.work_email}}

    Subject: e.g., Time Off Request from {{object.employee_id.name}}

    Body: Add leave type, dates, etc.

Save and test by submitting a time off request.

Make sure the manager is set in the employee form and has an email.

Hope it helps.