diff --git a/homeassistant/components/thethingsnetwork/config_flow.py b/homeassistant/components/thethingsnetwork/config_flow.py
index 7480e4cb1d922c4aaa0d3bc1cd55d0c8d05fa834..412c5da4ef9f6cc4b00e0c62fc3ed5ef868f3890 100644
--- a/homeassistant/components/thethingsnetwork/config_flow.py
+++ b/homeassistant/components/thethingsnetwork/config_flow.py
@@ -7,7 +7,7 @@ from typing import Any
 from ttn_client import TTNAuthError, TTNClient
 import voluptuous as vol
 
-from homeassistant.config_entries import ConfigEntry, ConfigFlow, ConfigFlowResult
+from homeassistant.config_entries import SOURCE_REAUTH, ConfigFlow, ConfigFlowResult
 from homeassistant.const import CONF_API_KEY, CONF_HOST
 from homeassistant.helpers.selector import (
     TextSelector,
@@ -25,8 +25,6 @@ class TTNFlowHandler(ConfigFlow, domain=DOMAIN):
 
     VERSION = 1
 
-    _reauth_entry: ConfigEntry | None = None
-
     async def async_step_user(
         self, user_input: Mapping[str, Any] | None = None
     ) -> ConfigFlowResult:
@@ -51,11 +49,9 @@ class TTNFlowHandler(ConfigFlow, domain=DOMAIN):
 
             if not errors:
                 # Create entry
-                if self._reauth_entry:
+                if self.source == SOURCE_REAUTH:
                     return self.async_update_reload_and_abort(
-                        self._reauth_entry,
-                        data=user_input,
-                        reason="reauth_successful",
+                        self._get_reauth_entry(), data=user_input
                     )
                 await self.async_set_unique_id(user_input[CONF_APP_ID])
                 self._abort_if_unique_id_configured()
@@ -67,8 +63,8 @@ class TTNFlowHandler(ConfigFlow, domain=DOMAIN):
 
         # Show form for user to provide settings
         if not user_input:
-            if self._reauth_entry:
-                user_input = self._reauth_entry.data
+            if self.source == SOURCE_REAUTH:
+                user_input = self._get_reauth_entry().data
             else:
                 user_input = {CONF_HOST: TTN_API_HOST}
 
@@ -92,11 +88,6 @@ class TTNFlowHandler(ConfigFlow, domain=DOMAIN):
         self, entry_data: Mapping[str, Any]
     ) -> ConfigFlowResult:
         """Handle a flow initialized by a reauth event."""
-
-        self._reauth_entry = self.hass.config_entries.async_get_entry(
-            self.context["entry_id"]
-        )
-
         return await self.async_step_reauth_confirm()
 
     async def async_step_reauth_confirm(