Adobe apps periodically validate your license (about every 30 days) and need the Creative Cloud background service and stored credentials to confirm activation; flaky connectivity, corrupted credential/keychain entries, or hitting device-activation limits often force repeat sign-in prompts.
Fix it by updating the Creative Cloud desktop app, enabling its login/startup item, signing out then back in, and removing Adobe credential entries from your OS Keychain or Windows Credential Manager; also visit account.adobe.com to deactivate any unused devices and free activations.
If prompts continue, run the Creative Cloud Cleaner, collect log files and contact Adobe Support (chat) for a license-storage repair; for permanently offline machines ask your org about Adobe Enterprise serial licensing, which supports offline activation.
These are key methods that we can offer. If you have more, please share.