Keys #~ and /: are not working on Librem 13v3 and Librem 15v3 devices with UK keyboard layout.
Reproducible on other operating systems.
Cause of the issue determined to be a faulty keyboard embedded controller firmware. Purism SPC issued RMA for all affected devices. Flashing fixed EC firmware fixes the problem, and PureOS correctly recognizes the mentioned keyboard keys.
NOTE: Anyone with the problem should contact Purism technical support.
(This ticket is for UK devices. For US devices, please see T431)