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Problems with signature Debian testing

Shannon Markiewicz 
I am getting the following error when trying to update packages for 
jessie-cran3/

W: GPG error: http://cloud.r-project.org/bin/linux/debian jessie-cran3/ 
Release: The following signatures were invalid: 
6212B7B7931C4BB16280BA1306F90DE5381BA480
E: The repository 'http://cloud.r-project.org/bin/linux/debian 
jessie-cran3/ Release' is not signed.
N: Updating from such a repository can't be done securely, and is 
therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user 
configuration details.


I have tried to get the key:

sudo apt-key adv --keyserver keys.gnupg.net --recv-key 
6212B7B7931C4BB16280BA1306F90DE5381BA480

sudo apt-key adv --keyserver keys.gnupg.net --recv-key 381BA480

Neither works.  Is there some other command I should be using?