I'm trying to add a digital signature to my python add-in. I'm using ArcDesktop 10.3, and the ESRISignAddIn.exe utility from the 'Python Add-In Wizard' download. After running the exe from the ArcDesktop bin folder i get the message that 'The add-in was signed successfully', however when I double-click the .esriaddin, the dialog gives the following warning 'WARNING: This Add-In file contains invalid digital signatures.'. The 'Source is trusted' check box is checked, but the 'Signature is valid' check box is not checked.
This is occurring immediately after I have run the utility so the file hasn't been modified.
Does anyone know what the issue is?
Thanks for your help!