The entity type [entity name] does not have an "revision_created" entity revision metadata key

Here is the answer that was added into the question originally:

I solved this problem by adding this in my entity file (in @ContentEntityType) :

 * revision_metadata_keys = {
 *     "revision_user" = "revision_user",
 *     "revision_created" = "revision_created",
 *     "revision_log_message" = "revision_log"
 *   },

Perhaps that could help somebody.