Hello,
It seems  like its necessary to trim the trailing spaces at the end of the testcases names, otherwise in the second run of a report it would be considred a new testcase.
Making the ALM server dening it for duplicate testcase.

N.B : The spaces are correctly removed in the POST request sent to the server.

Fix pull request: https://github.com/jenkinsci/hpe-application-automation-tools-plugin/pull/390

Pipeline logs :
Session created.
INFO: Checking test folder...
INFO: Checking testset folder...
INFO: Uploading ALM Entities...
Failed to create Entity:tests:owner=wichoumsubtype-id=EXTERNAL-TESTtesting-framework=JUnittesting-tool=AnyTestingToolname=sample_Create JDDs aléatoire pondéré ut-package-name=ut-method-name=Create JDDs aléatoire pondéré parent-id=1172ut-class-name=sample
ERR: There's exception while uploading C:\Users\wichoum\Downloads\hpe-application-automation-tools-plugin-micro-focus-application-automation-tools-plugin-6.8\work\jobs\Upload Test Results HPI\builds\11\archive\test_results\NOM-CTRL-INFOCARTE-003_PCAC_NETMJ_v2_junit_report.xml. com.microfocus.application.automation.tools.results.service.ExternalEntityUploadException: Failed to create Entity:tests:owner=wichoumsubtype-id=EXTERNAL-TESTtesting-framework=JUnittesting-tool=AnyTestingToolname=sample_Create JDDs aléatoire pondéré ut-package-name=ut-method-name=Create JDDs aléatoire pondéré parent-id=1172ut-class-name=sample
INFO: 'Upload test result to ALM' Completed.