Check if Windows
Defender feature Ransomware protection is enabled.
If so, configure it to add Quicken as an "allowed app" without
turning off Ransomware protection:https://community.quicken.com/discussion/7857675/faq-windows-defender-controlled-folder-access
Are you getting
"Oops, something went wrong"?
Have you recently enabled a VPN? If so, this might be the problem. Try turning
the VPN off and see if that helps.
Do you use Quicken Mac or Quicken for Windows? US or Canadian
What version, edition level and release of Quicken are you using?
Click Help / About Quicken (Mac: Quicken / About Quicken) to get this
What version of Windows or Mac OS are you using?