In the past I've had trouble connecting to external monitors using DisplayLink chips, but I don't think this laptop is using DisplayLink hardware. The HW probe is at https://linux-hardware.org/?probe=a2817e6e7e.
I would normally troubleshoot by tailing the syslog as I plug the monitor cable into the laptop and seeing what error messages come up. In this case, the only messages I get are:
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Jan 21 11:38:18 alkaid kernel: [20119.047917] ACPI BIOS Error (bug): Could not resolve symbol [\_GPE._L2B], AE_NOT_FOUND (20210730/psargs-330)
Jan 21 11:38:18 alkaid kernel: [20119.047923] ACPI Error: Aborting method \_SB.PC00.LPCB.H_EC._Q86 due to previous error (AE_NOT_FOUND) (20210730/psparse-529)
Does anyone know if there's some unsupported hardware that preventing the laptop from connecting to the monitor, or have any other ideas about how to continue troubleshooting?