Michele, here is what you can try:
1. Sign out from Creative Cloud and sign back in.
- https://helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html
- https://helpx.adobe.com/x-productkb/policy-pricing/activation-network-issues.html
2. CC asking for serial number
3. CC unexpectedly revert to trial
Please share the results after performing the steps.