When attempting to open a Citavi cloud project, you get the following error message:
A connection to the Citavi Cloud could not be established. The project could not be opened.
Log in to Citavi again. Make sure not to use the option "My university". Instead use the email address and password associated with your Citavi Account. If you no longer remember your password, click "Forgot your password?" to reset it.
To log in, follow the steps in the FAQ article "Missing cloud project" under solution 1.