Before GA4 data appears in your Daylytix audits, you need to tell Daylytix which GA4 property to connect to. This is done by entering the numeric property ID — a common source of confusion because GA4 has several different ID formats.

Which ID do you need?

GA4 uses three different IDs, and only one of them works with Daylytix:

Wrong — Measurement ID
G-XXXXXXXXXX
Used in your gtag.js website code. Starts with "G-". Does NOT work with the Analytics Data API.
Wrong — Account ID
123456789
Your Google Analytics account number. Found top-left in GA4. Different from the property ID.
Correct — Property ID
987654321
A numeric ID found in GA4 → Admin → Property Settings. This is what Daylytix needs.

How to find your property ID

1

Open Google Analytics

Go to analytics.google.com and make sure you're viewing the correct GA4 property (not a Universal Analytics property — those end in "-1" in the property selector).

2

Open Admin settings

Click the Admin gear icon in the bottom-left of Google Analytics.

3

Click Property Settings

In the middle column (Property), click Property Settings. The Property ID is displayed prominently at the top of this page — it's a plain number like 987654321.

4

Copy the Property ID

Click the copy icon next to the Property ID number. Do not include any text prefix — just the number itself.

5

Enter it in Daylytix

In Daylytix, go to Settings → Integrations → GA4 Property ID, paste the number, and click Save.

Testing the connection

After saving the property ID, click the Test GA4 button in Settings → Integrations. This makes a test API call and shows either a success message with sample data, or a specific error message to help you diagnose the problem.

Common errors:

  • "Property not found" — wrong property ID, or the service account doesn't have access to that property
  • "Permission denied" — the service account JSON has not been granted access to this GA4 property. Add the service account email as a Viewer in GA4 → Admin → Account Access Management
  • "Invalid argument" — you've entered the Measurement ID (G-XXXXXXXX) instead of the numeric Property ID

Managing multiple client properties

Daylytix stores one GA4 Property ID at a time. If you manage multiple clients with different GA4 properties:

  1. Before auditing a client site, go to Settings → Integrations and update the GA4 Property ID to that client's property
  2. Run the audit — GA4 data is fetched using the current property ID
  3. The property ID used is recorded with the audit, so historical audits retain their correct data

After updating the property ID and running the audit, the GA4 data populates the GA4 tab with: top pages by sessions, high bounce rate pages, low engagement pages, and session-level KPIs.

💡
Agency tip: Create a single service account and add it as a Viewer to all your clients' GA4 properties. Then just swap the Property ID in Daylytix settings before each client audit — no new credentials needed.

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