If you're on reasonably updated distribution, setting the GROUP in the udev rule might be causing issues. The [uaccess way][0] is to just set the TAG.

    SUBSYSTEMS=="usb", ATTRS{idVendor}=="vendor_id", ATTRS{idProduct}=="product_id", MODE="0660", TAG+="uaccess"

The Arch Wiki also has this note:

> For any rule adding the uaccess tag to be effective, the name of the file it is defined in has to lexically precede /usr/lib/udev/rules.d/73-seat-late.rules.

If your application is running as a different user, or in a Flatpak or snap, you may need some additional or alternative configuration.

[0]: https://wiki.archlinux.org/title/Udev#Allowing_regular_users...