MAC Error

[mascanc]

I am trying to enrol a Java simulated RSU. However, when I receive the enrolment response, I have:

`it.pki.ITSException: Unable to decrypt the response received from 20200804
at it.cits.security.pki.RSU.initialEnrollment(RSU.java:252)
at it.cits.security.pki.TestObtainAT.test(TestObtainAT.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:628)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:117)

Caused by: org.certificateservices.custom.c2x.etsits102941.v131.DecryptionFailedException: Error, couldn't decrypt EnrolmentResponseMessage(: Invalid cipher text when performing symmetric decrypt: mac check in CCM failed
at org.certificateservices.custom.c2x.etsits102941.v131.generator.ETSITS102941MessagesCaGenerator.decryptAndVerifyEnrolmentResponseMessage(ETSITS102941MessagesCaGenerator.java:408)
at it.cits.security.pki.RSU.initialEnrollment(RSU.java:246)
... 54 more
Caused by: java.security.GeneralSecurityException: Invalid cipher text when performing symmetric decrypt: mac check in CCM failed
at org.certificateservices.custom.c2x.common.crypto.DefaultCryptoManager.symmetricDecryptIEEE1609_2_2017(DefaultCryptoManager.java:831)
at org.certificateservices.custom.c2x.ieee1609dot2.generator.SecuredDataGenerator.decryptDataWithSecretKey(SecuredDataGenerator.java:459)
at org.certificateservices.custom.c2x.ieee1609dot2.generator.SecuredDataGenerator.decryptData(SecuredDataGenerator.java:475)
at org.certificateservices.custom.c2x.etsits102941.v131.generator.ETSITS102941MessagesCaGenerator.decryptAndVerifyEnrolmentResponseMessage(ETSITS102941MessagesCaGenerator.java:406)
... 55 more
Caused by: org.bouncycastle.crypto.InvalidCipherTextException: mac check in CCM failed
at org.bouncycastle.crypto.modes.CCMBlockCipher.processPacket(CCMBlockCipher.java:343)
at org.bouncycastle.crypto.modes.CCMBlockCipher.doFinal(CCMBlockCipher.java:146)
at org.certificateservices.custom.c2x.common.crypto.DefaultCryptoManager.symmetricDecryptIEEE1609_2_2017(DefaultCryptoManager.java:829)
... 58 more

`

I have been told that a similar issue happened during the last year's ETSI plug test. Any hints?