How to disable signature verification/validation.

The platform I'm working with is Adobe Acrobat Pro 11.
     The forms that my place of employment uses require signatures from the client and our representative. We are using an Ipad on the field to present forms and obtain signatures from clients. The forms once singed are emailed to ourselves so that we can store them in our server. The problem we have encountered is that once the documents is signed and we try to open it on our PCs (windows) we get the infamous message- "At least one signature is invalid..."  Our agency does not need the signature to be certified or validated, all we require is that the signature be carried over digitally with the form so we can keep in our records. Is there a way around this problem? I have searched on the forum for an answer but I haven't found one yet.
Thank you.

Thanks for the file. The problem is you're using digital signature fields with PDF Expert, but Acrobat/Reader don't have a way to validate such signatures (because they can't be). I assumed that you would not use signature fields and instead simply use the signature tool in PDF Expert to e-sign. These two different methods result in the same type of things, namely an appearance of a hand drawn signature, but neither are digital signatures. In the case of the digital signature field, it merely sets the field appearance. So I would suggest removing the signature fields and use the signature tool in PDF Expert instead.
Here's a bit more info: https://helpspot.readdle.com/en/index.php?pg=kb.page&id=124

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