We made a project for a company that worked well, but now they asked a new build and doesn't work anymore (in new devices). They send new id devices and I generated the ossig, but when they try to play receive the message "The apk is not assigned". I already signed the apk and put the ossigs.
I've gotten that exact combination of Unity and SDK to work here. Are you sure you put the osig(s) in the Assets/Plugins/Android/assets folder?
You also might want to clarify the nature of what your client is seeing. Are they seeing a signature problem when they try to install it, or when they try to run it? If it happens when they install, then it probably means you signed the APK via Player Settings, and you need to ensure you use the same key or else they will not be able to update. If you can't re-sign it like you did before, a workaround might be to have your client uninstall the old app before installing the new one (I think that works but not 100%).
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