There may be several reasons for this:

• Your account must first be verified and this may take some time.
  What to do: Please check your emails, you will receive a notification as soon as your account has been finally confirmed and bookings are possible.
• You do not have the status “PhD” in your OpenCampus account.
  What to do: Write an email to hgs-workshops@hu-berlin.de, explain your situation and let us know that you would like to book the event.
• You are not a member of FU, HU, TU, or Charité (Berlin University Alliance), but you cooperate with one of them in your doctorate.
  What to do: Write an email to hgs-workshops@hu-berlin.de, explain your situation and let us know that you would like to book the event.