Here are some possible solutions to your issue:
- First, make sure you have the correct version and the latest version of TurboTax installed. If your code is for TurboTax Desktop then the code will not work for TurboTax Online and the other way around.
- Make sure that the license code from the confirmation email, not a receipt number, the code is 16 digits.
- Copy and paste the 16-digit code directly from your email to avoid manual entry errors
- Temporarily disable firewalls, antivirus, or VPNs, as they can block the activation server
- Right-click the TurboTax icon and select "Run as administrator"
If these fail you will need to contact TurboTax.