Hello Andreas,
Thank you for your question.
May we know what your operating system please.
Please logout of EMOTIV APP and log back in again. The unity example will authorize again. If the issue still happen. Please email support@emotiv.com and send us the cortex log.
Log path on Windows
C:\ProgramData\Emotiv\Cortex\v2\logs
Log path on Mac
“/Library/Application Support/Emotiv/Cortex/v2/logs”
Looking forward to your follow up.