Error while uploading testcase using Zephyr native importer

[Fulvio Felicioli]

Hi Team,

I am trying to upload test cases from excel sheet to JIRA using Zephyr Test Cases native importer tool. While uploading, I got the below error:

Our Jira is v8.5.1, I attach also the excel file used for the test. We tried every possible combination of fields mapping and several different discriminator with no luck.
Can anyone help to resolve this issue?

TEST_1tc_1ts_01.xlsx