Hey there, that is a tricky ask, because it is difficult to report on something NOT happening, which is effectively what you want. There are two directions I am thinking of that could potentially help:
- You could hypothetically set up a People Performance report with custom columns, where a custom column could be all people having filled out a specific form and any field on the form not having received an update in the same time window. Does not work generically, but only for specific situations you want to monitor for.
- Assuming the same scenario, if someone tries to fill something out in the form and the value somehow is not accepted, my assumption would be the form doesn't submit and the person does not land on the thank you page. This is something you could monitor for via your Analytics set up.