Can't remove custom properties

[CC-Oliver]

On a free HubSpot portal, there is a limit of ten custom properties.

Facebook instant forms seem to create custom properties based on the questions asked within the form.

In one portal, we have three custom contact properties which have been created by a Facebook form.

These properties are showing as 'In Use' on the form, which means I can't delete them.

The form itself doesn't exist in the ad account.

Is it possible to remove this form from HubSpot's ad centre, so that I can remove the properties and free up the space for other custom properties?

Thanks in advance. 🙂

[CC-Oliver · Accepted solution]

I managed to solve the issue by finding, and archiving the form in question, and the properties are no longer in use anywhere (around a 15 minute delay for the form to disappear from HubSpot). I could then remove the properties 🙂