Howdy!
We have escalated this 1910 error to our team for investigation, which is currently underway. Until we have more information to share, I do recommend the following troubleshooting:
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Reset Windows Firewall following the drop-down steps Here. Ensure any personal anti-virus is fully set up to exclude the Battle.net and Diablo IV folders as well.
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Disable all startup programs to help rule out any third-party software conflicts following the steps Here.
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Shut down the PC. Power Cycle the home network’s modem and router to refresh the connection to all devices on the network and to the Internet Service Provider. Steps on how to do this can be found Here.
Once the network is back online, turn back on the PC and retest.