diff --git a/.dev.vars.example b/.dev.vars.example
index f0fd0e1..f0c881b 100644
--- a/.dev.vars.example
+++ b/.dev.vars.example
@@ -1,3 +1,3 @@
-# Cloudflare Access (required in production)
+# Cloudflare Access (required in production). TEAM_DOMAIN may be the base Access URL or the full /cdn-cgi/access/certs URL.
 POLICY_AUD=your-access-policy-audience-tag
 TEAM_DOMAIN=https://your-team.cloudflareaccess.com
diff --git a/README.md b/README.md
index 2a897b6..8de25da 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Click the button above to deploy to your Cloudflare account. The deploy flow wil
 1. **Set up Email Routing** -- In the Cloudflare dashboard, go to your domain > Email Routing and create a catch-all rule that forwards to this Worker
 2. **Enable Email Service** -- The worker needs the `send_email` binding to send outbound emails. See [Email Service docs](https://developers.cloudflare.com/email-routing/email-workers/send-email-workers/)
 3. **Create a mailbox** -- Visit your deployed app and create a mailbox for any address on your domain (e.g. `hello@example.com`)
-4. **Configure Cloudflare Access** -- Enable [one-click Cloudflare Access](https://developers.cloudflare.com/changelog/post/2025-10-03-one-click-access-for-workers/) on your Worker under Settings > Domains & Routes. The modal will show your `POLICY_AUD` and `TEAM_DOMAIN` values. **You must set these are secrets for your Worker.**
+4. **Configure Cloudflare Access** -- Enable [one-click Cloudflare Access](https://developers.cloudflare.com/changelog/post/2025-10-03-one-click-access-for-workers/) on your Worker under Settings > Domains & Routes. The modal will show your `POLICY_AUD` and `TEAM_DOMAIN` values. `TEAM_DOMAIN` can be either your Access team URL or the full `.../cdn-cgi/access/certs` URL. **You must set these as secrets for your Worker.**
 
 ## Features
 
diff --git a/workers/app.ts b/workers/app.ts
index 96cc7e0..607525f 100644
--- a/workers/app.ts
+++ b/workers/app.ts
@@ -28,6 +28,17 @@ const requestHandler = createRequestHandler(
 	import.meta.env.MODE,
 );
 
+function getAccessUrls(teamDomain: string) {
+	const certsPath = "/cdn-cgi/access/certs";
+	const teamUrl = new URL(teamDomain);
+	const issuer = teamUrl.origin;
+	const certsUrl = teamUrl.pathname.endsWith(certsPath)
+		? teamUrl
+		: new URL(certsPath, issuer);
+
+	return { issuer, certsUrl };
+}
+
 // Main app that wraps the API and adds React Router fallback
 const app = new Hono<{ Bindings: Env }>();
 
@@ -54,11 +65,10 @@ app.use("*", async (c, next) => {
 	}
 
 	try {
-		const JWKS = createRemoteJWKSet(
-			new URL(`${TEAM_DOMAIN}/cdn-cgi/access/certs`),
-		);
+		const { issuer, certsUrl } = getAccessUrls(TEAM_DOMAIN);
+		const JWKS = createRemoteJWKSet(certsUrl);
 		await jwtVerify(token, JWKS, {
-			issuer: TEAM_DOMAIN,
+			issuer,
 			audience: POLICY_AUD,
 		});
 	} catch {
diff --git a/wrangler.jsonc b/wrangler.jsonc
index d66f503..53a65cd 100644
--- a/wrangler.jsonc
+++ b/wrangler.jsonc
@@ -11,6 +11,7 @@
 	],
 	"vars": {
 		// Production deploys must also define POLICY_AUD and TEAM_DOMAIN.
+		// TEAM_DOMAIN may be the base Access URL or the full /cdn-cgi/access/certs URL.
 		// The worker now fails closed outside local development if Access is not configured.
 		"DOMAINS": "example.com",
 		"EMAIL_ADDRESSES": []
@@ -67,4 +68,4 @@
 			]
 		}
 	]
-}
\ No newline at end of file
+}