Matomo Cloud - Javascript Tag - Server returns 400

I have a paid account for Matomo Cloud. I have tried to contact support, but did not receive any contact so far.

I have implemented the Matomo tag on my website, however, the server is returning a 400 code. Some traffic make it through the platform, but most of the traffic is being lost.

Follow an example of the hit failing -


I have changed the parts that could identify my client. This is quite urgent and although the Matomo Cloud says they offer support, I did not receive any response from them so far.
I have tested to create a new measurable, I get the same error.

Please, see attached the point of the code where it fails -

Any help would be appreciated.

Thank you!

Can you share the HTTP error message? You can see it in the network activity tab of the browser developer tool…
@lukas any idea?

Hi, Phillipe, thank you for the reply.

Please, find below the information. I hope that is what you are looking for (including the server response on the next reply as I can only upload one image per post).

Headers sent by us -

Server response:

Let me know this is not what you are looking for and I can get the correct information for you.

Thank you!

The response message is in the body, so in the Response tab :wink:

Hi Phillipe,

Thanks for the info. Please, see attached below -

Are you sure the ID site (1 in your case) is well configured?

Yes, I am 100% sure. I can even see some real time traffic now, but I am 100% sure there should be more based on my other platforms.

See below -

Please, see the measurable configuration below -

I have tested checking and unchecking the “Only track visits and actions when the action URL starts with one of the above URLs” option.

Some real-time traffic on the measurable 1 - Expected at least 10 times more.


@karthik, @Jason_1282 any idea?

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Hi @Adaptive ,

Could you please get in touch with Cloud support at

@karthik -

I have sent the email with all the info to the provided email.

Thank you!

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