diff --git a/lib/entitlements/backend/github_team/service.rb b/lib/entitlements/backend/github_team/service.rb
index 241ef0f..678f015 100644
--- a/lib/entitlements/backend/github_team/service.rb
+++ b/lib/entitlements/backend/github_team/service.rb
@@ -459,6 +459,11 @@ def add_user_to_team(user:, team:, role: "member")
           begin
             result = octokit.add_team_membership(team.team_id, user, role:)
             result[:state] == "active" || result[:state] == "pending"
+          rescue Octokit::UnprocessableEntity => e
+            raise e unless ignore_not_found && e.message =~ /Enterprise Managed Users must be part of the organization to be assigned to the team/
+
+            Entitlements.logger.warn "User #{user} not found in organization #{org}, ignoring."
+            false
           rescue Octokit::NotFound => e
             raise e unless ignore_not_found