I need a button in the view redirect to a website view, but nothing happens when the button is clicked, I checked the button with  a raise Warning and it works, but never redirects

xml:

<record id="quotation_details_tree" model="ir.ui.view">
        <field name="name">Detalle de cotizaciones</field>
        <field name="model">insurance.quotation_detail</field>
        <field name="arch" type="xml">
            <tree string="Detalles Cotizaciones">
                <field name="coverage" />
                <field name="payment_method" />
                <field name="price" />
                <field name="fee_amount" />
                <field name="company_id" />
                <button class="btn btn-primary btn-sm" type="object" name="issue_policy" string="Emitir" />
            </tree>
        </field>
    </record>

and python code in the quotation detail model:

def issue_policy(self):
        return {
            'type': 'ir.actions.act_url',
            'name': "Emitir póliza",
            'url': 'seguro/issue_policy/',
            'target': 'self',
            'context': self, 
        }

The qweb page it is working, I can access it through the url.

What is the problem?