Run the check
Record the affected key with deliberate single taps in the chatter tool.
Compare a plain text editor with the original application.
Turn off one keyboard macro or remapping profile and repeat.
Read the result
Two non-repeat keydown events after one intended tap narrow the search to input delivery.
Limits and next step
The browser cannot see contacts, and intended finger presses are not independently measured.
Repeat the check after changing one setting or connection. Keep a record of what changed before deciding whether the device needs service.