The eLicenser system is legendary for its cryptic error messages. Here are the most common ones when dealing with your activation code.

The location of your code depends on how you acquired Cubase:

Have a specific eLicenser error? Visit the official Steinberg forum or the r/Cubase subreddit for community support.

If you upgraded from Cubase Elements to Pro:

Once you migrate a license, the original eLicenser activation code becomes permanently useless. You cannot revert to the dongle system.