Before you can generate a new offline license file, you must free up the code from its current assignment.

To help me provide more tailored advice, could you clarify you are running Nessus on and whether you are using a standard virtual machine or a Docker container ? Share public link

Remember these key takeaways:

Note: Tenable limits how many times you can manually reset a license via the portal within a specific timeframe (usually a few times per year). If you have exceeded this limit, you must contact Tenable Support to request a manual reset. Step 2: Generate a New Challenge Code

Wait a few minutes to ensure the backend servers have updated. Proceed with the process again. How to Perform Proper Offline Activation (To Avoid Errors)