Adobe Creative Cloud has its own web browser for login, and it is not compatible with Security Keys or TouchID.
If you have another Duo device (e.g. Android / iOS device) or Duo hardware token, use that to complete your login to Creative Cloud.
If you don't have another Duo device, you may use your Security Key or TouchID to generate a temporary Duo code at https://secure.onid.oregonstate.edu/duo/temporary-code. You would then use the temporary code to complete Duo authentication for Adobe Creative Cloud.
For assistance with Duo, please contact your department's IT Helpdesk, or the IS Service Desk