Download snap “lxd” (10756) from channel “stable” (invalid credentials) when trying to install

Just upgraded from bionic to cosmic. Part of that process migrates from deb lxd to snap lxd. The upgraded succeeded except for the lxd package. I get this error when trying to complete the upgrade or when installing lxd snap using snap command.

snap install lxd error: cannot perform the following tasks: - Download snap "lxd" (10756) from channel "stable" (invalid credentials) 

Why do I get this? What credentials? Where is the snapd error log?