diff --git a/app/config.py b/app/config.py
index 241a0d1..ea736f4 100644
--- a/app/config.py
+++ b/app/config.py
@@ -90,7 +90,6 @@ class Config(pydantic.BaseModel):
     name: str
     summary: str
     https: bool
-    id: str = None
     icon_url: str
     secret: str
     debug: bool = False
@@ -113,6 +112,9 @@ class Config(pydantic.BaseModel):
     sqlalchemy_database: str | None = None
     key_path: str | None = None
 
+    # Only set when the app is served on a non-root path
+    id: str | None = None
+
 
 def load_config() -> Config:
     try:
@@ -147,6 +149,9 @@ CONFIG = load_config()
 DOMAIN = CONFIG.domain
 _SCHEME = "https" if CONFIG.https else "http"
 ID = f"{_SCHEME}://{DOMAIN}"
+
+# When running the app on a path, the ID maybe set by the config, but in this
+# case, a valid webfinger must be served on the root domain
 if CONFIG.id:
     ID = CONFIG.id
 USERNAME = CONFIG.username
@@ -179,7 +184,9 @@ if CONFIG.emoji:
     EMOJIS = CONFIG.emoji
 
 # Emoji template for the FE
-EMOJI_TPL = '<img src="{base_url}/static/twemoji/{filename}.svg" alt="{raw}" class="emoji">'
+EMOJI_TPL = (
+    '<img src="{base_url}/static/twemoji/{filename}.svg" alt="{raw}" class="emoji">'
+)
 
 _load_emojis(ROOT_DIR, BASE_URL)
 
diff --git a/app/templates/login.html b/app/templates/login.html
index 5879158..bc0512d 100644
--- a/app/templates/login.html
+++ b/app/templates/login.html
@@ -7,7 +7,7 @@
         {% if error %}
             <p class="primary-color">Invalid password.</p>
         {% endif %}
-        <form class="form" method="POST">
+        <form class="form" action="{{ BASE_URL }}/admin/login" method="POST">
             <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
             <input type="hidden" name="redirect" value="{{ redirect }}">
             <input type="password" placeholder="password" name="password" autofocus>
diff --git a/scripts/config_wizard.py b/scripts/config_wizard.py
index f5a75a2..22119e6 100644
--- a/scripts/config_wizard.py
+++ b/scripts/config_wizard.py
@@ -74,8 +74,6 @@ def main() -> None:
         dat["https"] = False
         proto = "http"
 
-    dat["id"] = f'{proto}://{dat["domain"]}'
-
     print("Note that you can put your icon/avatar in the static/ directory")
     dat["icon_url"] = prompt(
         "icon URL: ", default=f'{proto}://{dat["domain"]}/static/nopic.png'