A relevant denial from comment #2 is:

    AVC apparmor="DENIED" operation="open"
profile="snap.chromium.chromium" name="/run/udev/data/c166:0" pid=2802
requested_mask="r" denied_mask="r"

That should be allowed by connecting the raw-usb interface though.

Could you please ensure that said interface is connected, and repeat the
steps in comment #1 to collect more data? Thanks!

Note that edge isn't affected, because it's not packaged as a snap, and
therefore isn't subject to strict confinement as chromium is.

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https://bugs.launchpad.net/bugs/1890365

Title:
  [snap] Web Serial fails to access local device

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