This error can be received if the discount code is not associated with a participation type or if the discount code is available only to an eligible group. To fix this:
  1. Navigate to Fundraising > TeamRaiser
  2. Click Edit next to the TeamRaiser in question
  3. Click on Step 8. Manage Discounts
  4. On the discount in question, click Associate
  5. Choose the participation type to use this discount code and click Add
  6. Click Save
  7. Click Finish
If the code does have a participation type associated, you may need to ensure it does not have an eligible group associated. To fix this:
  1. Navigate to Fundraising > TeamRaiser
  2. Click Edit next to the TeamRaiser in question
  3. Click Step 8. Manage Discounts
  4. Click Edit next to the discount in question
  5. Step 9 > select d. Define Eligiblity
  6. Check under 2.Eligible groups  
  7. Ensure there are no groups under d. Define Eligiblity, if you would prefer everyone to be able to register
If you have selected the Any registered Group, then the individuals will have to be logged in.