diff --git a/homeassistant/components/telegram_bot/__init__.py b/homeassistant/components/telegram_bot/__init__.py
index a9f51fcc74e..e418336eaa2 100644
--- a/homeassistant/components/telegram_bot/__init__.py
+++ b/homeassistant/components/telegram_bot/__init__.py
@@ -11,6 +11,7 @@ from telegram.error import InvalidToken, TelegramError
 import voluptuous as vol
 
 from homeassistant.components.script import DOMAIN as SCRIPT_DOMAIN
+from homeassistant.config_entries import ConfigEntryState
 from homeassistant.const import (
     ATTR_DOMAIN,
     ATTR_ENTITY_ID,
@@ -739,10 +740,11 @@ def _build_targets(
         for chat_id in chat_ids:
             # map chat_id to notify entity ID
 
-            if not hasattr(config_entry, "runtime_data"):
+            if config_entry.state is not ConfigEntryState.LOADED:
                 raise ServiceValidationError(
                     translation_domain=DOMAIN,
-                    translation_key="missing_config_entry",
+                    translation_key="entry_not_loaded",
+                    translation_placeholders={"telegram_bot": config_entry.title},
                 )
 
             entity_id = entity_registry.async_get_entity_id(
diff --git a/homeassistant/components/telegram_bot/config_flow.py b/homeassistant/components/telegram_bot/config_flow.py
index e93aa80126d..5217f26742b 100644
--- a/homeassistant/components/telegram_bot/config_flow.py
+++ b/homeassistant/components/telegram_bot/config_flow.py
@@ -588,6 +588,12 @@ class AllowedChatIdsSubEntryFlowHandler(ConfigSubentryFlow):
     ) -> SubentryFlowResult:
         """Create allowed chat ID."""
 
+        if self._get_entry().state != ConfigEntryState.LOADED:
+            return self.async_abort(
+                reason="entry_not_loaded",
+                description_placeholders={"telegram_bot": self._get_entry().title},
+            )
+
         errors: dict[str, str] = {}
 
         if user_input is not None:
diff --git a/homeassistant/components/telegram_bot/strings.json b/homeassistant/components/telegram_bot/strings.json
index 367a5b52793..eb2ade5d198 100644
--- a/homeassistant/components/telegram_bot/strings.json
+++ b/homeassistant/components/telegram_bot/strings.json
@@ -87,7 +87,8 @@
   "config_subentries": {
     "allowed_chat_ids": {
       "abort": {
-        "already_configured": "Chat already configured"
+        "already_configured": "Chat already configured",
+        "entry_not_loaded": "[%key:component::telegram_bot::exceptions::entry_not_loaded::message%]"
       },
       "entry_type": "Allowed chat ID",
       "error": {
@@ -186,6 +187,9 @@
     "allowlist_external_dirs_error": {
       "message": "File path has not been configured in allowlist_external_dirs."
     },
+    "entry_not_loaded": {
+      "message": "{telegram_bot} is not loaded"
+    },
     "failed_to_load_file": {
       "message": "Failed to load file: {error}"
     },
@@ -204,9 +208,6 @@
     "missing_allowed_chat_ids": {
       "message": "No allowed chat IDs found. Please add allowed chat IDs for {bot_name}."
     },
-    "missing_config_entry": {
-      "message": "No config entries found or setup failed. Please set up the Telegram Bot first."
-    },
     "missing_input": {
       "message": "{field} is required."
     },
diff --git a/tests/components/telegram_bot/test_config_flow.py b/tests/components/telegram_bot/test_config_flow.py
index 6d638600fa5..49564e100b5 100644
--- a/tests/components/telegram_bot/test_config_flow.py
+++ b/tests/components/telegram_bot/test_config_flow.py
@@ -484,6 +484,22 @@ async def test_subentry_flow(
     assert subentry.data == {CONF_CHAT_ID: 987654321}
 
 
+async def test_subentry_flow_config_not_ready(
+    hass: HomeAssistant, mock_broadcast_config_entry: MockConfigEntry
+) -> None:
+    """Test subentry flow where config entry is not loaded."""
+    mock_broadcast_config_entry.add_to_hass(hass)
+
+    result = await hass.config_entries.subentries.async_init(
+        (mock_broadcast_config_entry.entry_id, SUBENTRY_TYPE_ALLOWED_CHAT_IDS),
+        context={"source": SOURCE_USER},
+    )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "entry_not_loaded"
+    assert result["description_placeholders"] == {"telegram_bot": "Mock Title"}
+
+
 async def test_subentry_flow_chat_error(
     hass: HomeAssistant, mock_broadcast_config_entry: MockConfigEntry
 ) -> None:
diff --git a/tests/components/telegram_bot/test_telegram_bot.py b/tests/components/telegram_bot/test_telegram_bot.py
index 5f3611f7e0d..7ade0ba3ffe 100644
--- a/tests/components/telegram_bot/test_telegram_bot.py
+++ b/tests/components/telegram_bot/test_telegram_bot.py
@@ -1079,7 +1079,8 @@ async def test_send_message_config_entry_error(
         )
 
     await hass.async_block_till_done()
-    assert err.value.translation_key == "missing_config_entry"
+    assert err.value.translation_key == "entry_not_loaded"
+    assert err.value.translation_placeholders == {"telegram_bot": "Mock Title"}
 
 
 async def test_delete_message(