--- broker.original
+++ M09-ambiguous
@@ -6455,7 +6455,6 @@
           for (const tag of addressed.tags) {
             const candidates = new Set([this.#named(s.business, tag), tag].filter((instance) => members.includes(instance)));
             if (!candidates.size) fail('unknown-addressee');
-            if (candidates.size > 1) fail('addressee-ambiguous');
             selected.add([...candidates][0]);
           }
           const targets = threads.filter((t) => !addressed.tags.length || selected.has(t.instance));