Custom URL scheme (dvagsc://) no longer forwarded to Windows VM via Parallels Desktop

Hi everyone,

a custom Windows URL scheme "dvagsc://" used to automatically open a Windows application when clicked on macOS (e.g., in Apple Mail). Parallels Desktop forwarded the URL into the running Windows 11 VM. This stopped working recently.

Environment:

• macOS 15/26 "Tahoe"
• Parallels Desktop (latest version)
• Windows 11 Pro VM
• Parallels Tools installed
• Integration features enabled (application sharing etc.)
• macOS apps tested: Apple Mail, Terminal ("open dvagsc://test")

Expected behavior:
Clicking dvagsc:// should launch Parallels (if needed) and forward the URL directly into the VM so the Windows application can process it. This worked flawlessly for a long time.

Current behavior:

• macOS says "No application specified to open the URL"
• If I manually choose Parallels Desktop, only the Control Center opens
• The URL is NOT forwarded to the VM
• Even when the VM is already running, Windows never receives anything

What I have tried:

• Reinstalled Parallels Tools
• Rebooted macOS and VM
• Verified all integration settings
• Created a custom macOS URL handler (Info.plist + duti)
  • Still only opens Control Center, no URL forwarding

What I want:

1. Restore the previous behavior (URL forwarded directly into the VM), or
2. Allow mapping this custom scheme to a specific Windows application (e.g., Edge inside Windows)

Important: I do NOT want Edge as default macOS browser. Only this one custom scheme should be handled inside Windows.

Questions:

1. Is forwarding custom URL schemes to the VM still supported?
2. Was this changed/removed in a recent Parallels Desktop update?
3. Is there an official method to map a macOS custom scheme into a Windows app?
4. If the feature is deprecated, is there any recommended workaround?

Happy to provide version numbers or a reproducible test case (e.g. "open dvagsc://test" in Terminal).

Thanks in advance!