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I have been using AD2PI on my LAN for a year WITHOUT encryption.
Now I want to start using HTTPS, so I selected "Encrypt ser2sock" in the setup.

This produces the following errors:
Device Testing
Opening device ✘ Failed to open the device: [('SSL routines', 'tls_process_server_certificate', 'certificate verify failed')]
Saving device configuration ✘ There was an error sending the command to the device.
Keypad communication (Send) ✘ There was an error sending the command to the device.
Keypad communication (Receive) ✘ There was an error sending the command to the device.

If I go back and DESELECT "Encrypt ser2sock", the device tests pass.

What should I do to get encryption to work?
Thanks in advance for any suggestions.
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Setup is as follows:
Device: AD2PI
Device Location: Local Device
Path: /dev/serial0
Baudrate: 115200
Share AlarmDecoder on your network: checked
SER2SOCK Configuration Path: /etc/ser2sock
Address: localhost
Port: 10000
Encrypt ser2sock?: Tests fail if checked, but pass if unchecked
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Versions
Firmware: V2.2a.8.8
AlarmDecoder Webapp and Library are "Up to date" as of today.