I'm seeing same error message when I create MIGO script (A07, R10, 555), the material document can be posted in SAP successfully but from Winshuttle I'm seeing error message 'Runtime error RAISE_EXCEPTION has occurred'
and from log file
ERROR 11:04:37,020 437ms Winshuttle.Core.SapHelper.Authorization.TransactionAuthorization.CheckWSUserAccess | Exception found in getting winshuttle rfc read accessERROR 11:17:21,103 1721ms Winshuttle.Core.ClientUtility.EncryptionHandler.DecryptString | Error in decrypting string :
Please attach your script and template (anonymize the data, as needed) and provide a high level overview of what you're trying to do. Also if you run in debug mode, please provide a screen shot of where it is failing.
Please ask your security team to compare the user authorizations of the two for which it did not work with the one for which it does. Quite sure they have different RFC authorizations. It is most likely not linked to your script nor to winshuttle.