Field data constraint violation - Unable to complete operation due to existing constraints violation

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SaaS

What are the exact steps to reproduce this issue?

Created a form. At some point it stopped receiving inputs, instead showing this earror message: " Field data constraint violation - Unable to complete operation due to existing constraints violation"
Please advise

It sounds as though a field level permission was set for this field. Click the field dropdown menu and select field level permissions and ensure both the correct setting has been set that you want for this field and optionally also toggle the allow field to be set in rows created through form to enabled.

Thank you for the suggestion, but I think this will not help. First I do not have this option, or I cannot find it. I’m on the free version. Second, I did not change anything from when I shared the form until it stopped working.

Could you check the advanced tab of your fields to see if there have any field constraints added to them?