There are 2 errors which produce the FNP error 0 message for which we have identified solutions:
1) That activation request yields no right to a license
If you receive the following error message following an attempt to activate S32 Design Studio, this is a known issue and we have a solution.

This issue is due to a recent event. On October 1st, 2019, Flexera made this change. Since NXP uses Flexera for product activations, we were affected.
The solution to the issue is to enable support for TLS 1.2 within your Internet Properties.
2) com.acresso.activation.handler.ServerException
If you receive the following error message following an attempt to activate S32 Design Studio, this is a known issue and we have a solution. This issue is known to occur on older releases of S32 Design Studio.

The version of FlexNet Publisher (FNP) used to activate the S32 Design Studio on your PC has an issue on some users machines. While we don't fully understand what change is happening to cause this issue, we have determined that an update to the version of FNP will resolve it. We have incorporated a newer version in the 3.5 release of S32 Design Studio.
Attached is a package of files (Activation.7z) which will allow you to update the version of FNP on your machine.
Enter the following command replacing the paths as noted. It should be possible to execute from CMD window located at any path. Make sure to use the ‘/’ instead of ‘\’ and if you have any paths with spaces, then enclose the full path with “.
For 64-bit OS:
C:/NXP/S32DS.3.5/jre/bin/java -Djava.library.path="{path to where you extracted the activation.zip}/Activation/cll/x64" -jar "{path to where you extracted the activation.zip}/Activation/license.jar" activateUI
For 32-bit OS:
C:/NXP/S32DS.3.5/jre/bin/java -Djava.library.path="{path to where you extracted the activation.zip}/Activation/cll/i86" -jar "{path to where you extracted the activation.zip}/Activation/license.jar" activateUI
If you have no existing S32DS installation from which to use Java, then please use the attached package (CLL_FNP.11.18.0.2.zip) and follow the instructions in the included .txt file. This package only works on Windows OS 64-bit.