There is no “direct” web action that would result is checking public keys, but if your two forms contain back-end code, that e.g. tries to access data from another server via @DbLookup or alike, and the signer of the form is not cross certified with the other servers certifier, this is what’s going to happen.
Could just be, that you have to sign your application (or template) with the right ID and you’re done. The tricky part most of the time is, to find that one piece of code that’s accessing the source it is not allowed to. Could be in every single field, even in a combo box getting its values from a formula …