The general warning order about the invasion being near was for all units operating in occupied France. The BBC also broadcast personal messages at a designated time in code for individual operatives and the various Maquis' in France.
The German high command knew about the general message regarding the invasion but didn't have all of the codes for the personal messages since they were specific to the individual groups. The Allies couldn't hide the buildup so it wasn't really a secret that we were coming as much as where we would land.
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