Solution
Most of the error messages mentioned below are caused by the incorrect entry of your license details. For ESET Mobile Security for Android activation, you must type in a License Key. Do not type in a username or password.
Error codes
If your error code starts with a 10 (for example, 10401001), you are experiencing a temporary problem caused by connection issues. We recommend that you try again later.
License has already expired. (20515002)
Your license has expired. You must renew your license to keep your device protected.
License cannot be used for this product. (20515003)
You have entered an incorrect product license type. Check to be sure that you have entered the license for ESET Mobile Security. To use the full version of ESET Mobile Security, you must purchase an ESET Mobile Security license.
Communication failed. The license key entered is invalid. (20515001)
You have entered an incorrect license key. Re-enter your license key.
