Hi,
We understand this might be related directly to S32DS and not to S32G. We can recommend opening this same thread under the S32DS public community, for them to provide better insight on the usage/activation of the tool:
S32 Design Studio - NXP Community
As from our side, which license are you using? You should have been provided with an activation license specific to S32DS v3.5, something like the one shown below:

You might also be able to access this license under the S32DS v3.5 download page, under the "License Keys" tab:
To verify that you are using the correct activation code/license.
If still this does not provide the expected outcome, we can recommend opening the same thread under the S32DS community, for them to take a look into your request.
We apologize for any inconvenience.
Please, let us know.