H50371 Fixed: Windows Fax and Scan Fails to Send Faxes on Windows 11 "The message could not be sent. An error has occurred."

Applies to: HiRO H50371 V92 56K USB-C/A Data Fax Modem

Operating System: Windows 11 (All editions and builds, including Home/Pro 24H2 and 25H2)

1. Symptom

When you attempt to send an outbound fax using Windows Fax and Scan, instead of dialing immediately, Windows opens a modern printer menu (the Unified Print Dialog) showing "This app doesn't support print preview."

If you click Cancel to exit this printer screen, the transmission aborts, and you receive the following error message:

"The message could not be sent. An error has occurred."

2. Why This Happens

In Windows 11, Microsoft introduced a modern, AppX-packaged printing interface. When Windows Fax and Scan tries to convert your document into a fax-compatible format, this new print dialog intercepts the request. Because the new dialog runs in a restricted, sandboxed container, it cannot communicate with the legacy virtual "Fax" printer queue, resulting in an aborted transmission.

3. Verified Hardware Compatibility

We have fully tested our modems under the latest Windows 11 operating systems to ensure complete peace of mind.

Compatible Models: The latest HiRO H50371 USB modems. (Including the EOL model H50228, H50353, H50363 and H50364)
Multipage Testing: All HiRO modems are verified 100% compatible for sending and receiving fax without timeouts, line drops, or page fragmentation.
Driver Standard: All HiRO modems leverage the stable, built-in Microsoft Inbox class driver for automatic, driverless Plug-and-Play setup under Windows 11.

4. Step-by-Step Resolution

To bypass the restricted Windows 11 print container and route faxes directly to your HIRO USB modem, configure Windows Fax and Scan to always run with elevated permissions. This forces the system to use the stable, legacy print pipeline.

Method: Always Run as Administrator (Recommended)

1. Click Windows button and search fax

2. Right click on Windows Fax and Scan and click Run as Administrator

Click Apply, then click OK to save the changes.

If you don't have Windows Fax and Scan, please refer to the following steps.

1. Open Start and select Settings.

2. Go to System and click Optional features.

3. Click View features next to Add an optional feature.

4. Scroll or search for Windows Fax and Scan in the list.

5. Select the checkbox next to it and click Next.

6. Click Install and ensure you have an active internet connection.