Fix Google sign-in problems in n8n

Last updated October 11, 2026

If you connect n8n to your own Google account, for Google Sheets, Google Drive or YouTube, two things often go wrong. Google says "Access blocked." Or it works for a week and then signs you out. Both have a short fix. It takes about 5 minutes.

Which one do you have?

• It worked, then stopped after about 7 days. Your Google app is still in "Testing." Google signs Testing apps out every 7 days. Do the fix below and publish the app.
• "Access blocked" and "can only be used within its organization" (Error 403: org_internal). Your Google project is set to Internal. A personal Gmail account needs External. See step 2.
• "Access blocked: app not verified." Your email is not on the test users list. While the app is in Testing, add your own email under Audience, Test users. Publishing the app (step 3) ends this problem too.
• YouTube says "Authorization failed" with the word youtubeSignupRequired. You picked your plain login, and it has no channel. Sign in again and pick the brand account. See step 5.

The fix, in order

Step 1. Open the right screen. Go to console.cloud.google.com, pick the project you made for n8n, then open Google Auth Platform.

Step 2. Fill in Branding and pick External. Under Branding, fill in the app name, the user support email and the developer contact email. Then add three links: the application home page, the application privacy policy link and the application terms of service link. Add the domain those links use under Authorized domains. Leave the logo empty. Save. Under Audience, choose External.

Step 3. Publish the app. Under Audience, click Publish app and choose In production. The button stays grey until Branding is saved with all four boxes filled.

Step 4. Sign in again in n8n. Open each Google credential in n8n and click Sign in with Google. Google shows "Google hasn't verified this app." That is normal for your own app that only you use. Click Advanced, then Go to your domain (unsafe), and allow it.

Step 5. YouTube only: pick the channel, not just the login. If your channel is a brand account, Google shows "Choose your account or a brand account." Pick the brand account that holds your channel. It usually has no email under its name.

Step 6. Check it. The Audience page should say In production. Run your workflow once.

Do not click "Go to verification" and do not upload a logo. Both make Google ask you to verify the app. A private app that only you use does not need that.

No website? Use our links.

If you do not have a website, you can use these for the three links and the domain. They worked for our own app. If you have your own site, use your own links and domain instead.

• Application home page: https://get.autopilotbackend.com
• Application privacy policy link: https://get.autopilotbackend.com/app-privacy
• Application terms of service link: https://get.autopilotbackend.com/app-terms
• Authorized domain: autopilotbackend.com

What we tested, and what we have not

We tested this in October 2026 with our own YouTube upload. After the steps above, a video uploaded to our channel. We have not yet confirmed how long Google Sheets and Google Drive sign-ins last on a published app. We check that around October 20 and will update this page. Google changes its screens, so a button name may be a little different.

One more limit: each Google project gets 10,000 units a day, and one YouTube upload costs about 1,600. That is about 6 uploads a day.

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This page is general information, not Google support. Google and n8n are separate companies and are not connected to Autopilot Backend.