hey @Coendw
thanks for trying. can you try this modyfication:
If(
Checkbox1.Value,
(
Patch(
'Periodic maintenance',
GalleryMaintenance.Selected,
{
'Last maintenance performed': Now(),
'Next maintenance': DateAdd(Now(), GalleryMaintenance.Selected.FrequencyinDays, TimeUnit.Days)
}
),
SubmitForm(FormJobMaintenance),
Navigate('Periodic maintenance job completed')
),
Notify("Checkbox must be completed", NotificationType.Error)
);
Let me know if my answer helped solving your issue.
If it did please accept as solution and give it a thumbs up so we can help others in the community.
Greetings