diff --git a/homeassistant/components/google_tasks/config_flow.py b/homeassistant/components/google_tasks/config_flow.py
index 965c215ee4d..795b6e6eff5 100644
--- a/homeassistant/components/google_tasks/config_flow.py
+++ b/homeassistant/components/google_tasks/config_flow.py
@@ -9,7 +9,7 @@ from googleapiclient.discovery import build
 from googleapiclient.errors import HttpError
 from googleapiclient.http import HttpRequest
 
-from homeassistant.config_entries import ConfigEntry, ConfigFlowResult
+from homeassistant.config_entries import SOURCE_REAUTH, ConfigFlowResult
 from homeassistant.const import CONF_ACCESS_TOKEN, CONF_TOKEN
 from homeassistant.helpers import config_entry_oauth2_flow
 
@@ -23,8 +23,6 @@ class OAuth2FlowHandler(
 
     DOMAIN = DOMAIN
 
-    reauth_entry: ConfigEntry | None = None
-
     @property
     def logger(self) -> logging.Logger:
         """Return logger."""
@@ -70,25 +68,24 @@ class OAuth2FlowHandler(
             self.logger.exception("Unknown error occurred")
             return self.async_abort(reason="unknown")
         user_id = user_resource_info["id"]
-        if not self.reauth_entry:
-            await self.async_set_unique_id(user_id)
+        await self.async_set_unique_id(user_id)
+
+        if self.source != SOURCE_REAUTH:
             self._abort_if_unique_id_configured()
             return self.async_create_entry(title=user_resource_info["name"], data=data)
 
-        if self.reauth_entry.unique_id == user_id or not self.reauth_entry.unique_id:
-            return self.async_update_reload_and_abort(
-                self.reauth_entry, unique_id=user_id, data=data
-            )
+        reauth_entry = self._get_reauth_entry()
+        if reauth_entry.unique_id:
+            self._abort_if_unique_id_mismatch(reason="wrong_account")
 
-        return self.async_abort(reason="wrong_account")
+        return self.async_update_reload_and_abort(
+            reauth_entry, unique_id=user_id, data=data
+        )
 
     async def async_step_reauth(
         self, entry_data: Mapping[str, Any]
     ) -> ConfigFlowResult:
         """Perform reauth upon an API authentication error."""
-        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(