[Archlinux] synergy - key could not be looked up remotely

Q:
Packages (1) synergy-1.7.3-3
Total Installed Size: 4.01 MiB
:: Proceed with installation? [Y/n]
(1/1) checking keys in keyring [######################] 100%
downloading required keys…
error: key “FC1B547C8D8172C8” could not be looked up remotely
error: required key missing from keyring
error: failed to commit transaction (unexpected error)
Errors occurred, no packages were upgraded.

A:
sudo pacman -S archlinux-keyring && sudo pacman -Syu

Reference:

• [SOLVED] error: key “A6234074498E9CEE” could not be looked up remotely