Working with existing InfoPath forms, while opening the form it is showing error as “Your user name or group membership cannot be verified because the form's security settings do not permit it.” As shown the below.
We can get this error due to form security error. To fix that we need to add the site to local sites by using the steps below.
Navigate to IE and open Internet Option from IE settings.
In the Security Tab, Select “Local Intranet” option and click on Sites button.
You can see “local Intranet” popup, click on “Advanced” button.
Add the Site to local intranet sites by clicking on Add button. Click on Close button.
Click on Ok button to Save “local Intranet” popup and Ok button to close internet options.
By opening the form we can see the form without any errors. Hope this helps.