What JIRA and Zephyr versions are you using? Please make sure that you are following the procedure listed on the KB below in order to update the add-on license. In addition, make sure there are no spaces at the beginning and end of the license code.
I have also tried to use the license that was provided by Zephyr and am having the same issue. I have followed the procedure we've used to install plugins and license them in the past. I then followed the instructions on the from the link you provided, with the same results. I have already generated 3 licenses today alone thinking that it was an issue with license being generated. Any other suggestions would be helpful.
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