Netbox Tabs

[an-adestis]

Problem Description:

I am developing a custom view in a NetBox plugin, but the custom tab (ViewTab) is not being displayed in the object view of the Certificate model.

Here is the relevant code snippet:
views.py:
from dcim.models import *
from dcim.forms import *
from dcim.tables import *
from dcim.filtersets import *

@register_model_view(Certificate, name='devices')
class CertificateAffectedDeviceView(generic.ObjectChildrenView):
queryset = Certificate.objects.all()
child_model = Device
table = DeviceTable
template_name = "adestis_netbox_certificate_management/device.html"
actions = {
'add': {'add'},
'export': {'view'},
'bulk_import': {'add'},
'bulk_edit': {'change'},
'bulk_remove_device': {'change'},
}

tab = ViewTab(
    label=_('Devices'),
    badge=lambda obj: obj.device.count(),
    hide_if_empty=False,
    weight=600
)

def get_children(self, request, parent):
    return Device.objects.restrict(request.user, 'view').filter(certificate=parent)

urls.py:
path('certificates/devices/', CertificateAffectedDeviceView.as_view(),
name='certificatedevices_list'),

Issue:
The custom tab (ViewTab) labeled "Devices" is not showing up in the Certificate detail view.
I expect a tab to appear on the certificate object page, allowing navigation to related Device objects.