Facebook Pixel warnings

Changes in Facebook ads might cause warnings sometimes. In the next article, we will review common facebook pixel warnings and what is the solution for them.

📋 Facebook pixel warning list:

1. Values Previously set 
2. PageView event missing deduplication parameter 
3. Make sure identical events share a matching deduplication key 

4. The Event missing some deduplication parameters

1. Values Previously set 

This warning comes usually after changing the UTM parameters to running ads, it wants to let you know that previous set values is not active anymore, there is nothing to worry about if you see this message.

2. PageView event missing deduplication parameter 

AnyTrack does not send PageView events and it counts on Facebook pixel code we add to the website to send it for us. If you see that the events are sent from the server - it might be an API connection with another platform.

3. Make sure identical events share a matching deduplication key 

After connecting AnyTrack with Facebook pixel we had some clients that got this message. AnyTrack has its own deduplication algorithm, so there is nothing to worry about.

4. The Event missing some deduplication parameters

In case that you keep firing an event for both client-side and server-side you might get duplication.

There are two solutions:

1. Delete the client side tracking and based on server-side.
2. Make sure that you have the parameters that help facebook do the matching.

In order to let facebook do the match the events from both sides should have:

1. the same name

2. the same value 

3. eventID parameter.

We send events from the server side with the eventID, therefore you will need to add it in your client-side tracking code.

Go to your tracking event code and add this parameter:
{eventID: 'EVENT_ID'}

You can review this example of how it should look like after adding the event ID parameter:

fbq('track', 'Purchase', {value: 12, currency: 'USD'}, {eventID: 'EVENT_ID'});

After doing that Facebook will know to match between client-side event and server-side event and you will have no duplications and no pixel warning.