fix: stabilize container validator startup

server/main.go

@@ -491,6 +491,13 @@ func main() {
 			globals.immutableTagNS[name] = true
 		}
 
+		if len(vconf.Required) == 0 && name != "tel" {
+			// Optional product phone registration uses the tel validator even
+			// when it is not required for an auth level. Other validators stay
+			// disabled when they are not explicitly required.
+			continue
+		}
+
 		var reqLevels []auth.Level
 		for _, req := range vconf.Required {
 			lvl := auth.ParseAuthLevel(req)