Comment 2 for bug 1991542

In case anyone else sees this, I had to do this to resolve the issue:

edit /etc/udev/rules.d/50-elgato.rules and add these lines:

# Elgato Stream Deck Mini
SUBSYSTEM=="usb", ATTRS{idVendor}=="0fd9", ATTRS{idProduct}=="0063", TAG+="uaccess"

# Elgato Stream Deck Original
SUBSYSTEM=="usb", ATTRS{idVendor}=="0fd9", ATTRS{idProduct}=="0060", TAG+="uaccess"

# Elgato Stream Deck Original (v2)
SUBSYSTEM=="usb", ATTRS{idVendor}=="0fd9", ATTRS{idProduct}=="006d", TAG+="uaccess"

# Elgato Stream Deck XL
SUBSYSTEM=="usb", ATTRS{idVendor}=="0fd9", ATTRS{idProduct}=="006c", TAG+="uaccess"

# Elgato Stream Deck MK.2
SUBSYSTEM=="usb", ATTRS{idVendor}=="0fd9", ATTRS{idProduct}=="0080", TAG+="uaccess"

Then sudo udevadm control --reload-rules

Then unplug and re-plug the device. It now works.