> ## Documentation Index
> Fetch the complete documentation index at: https://docs.invoca.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Tag Deployment Troubleshooting: Duplicate Query Parameters in a Test URL

> A test URL with two `?` query-string markers will fail Required Parameters checks — use `?` only once, then `&` for every parameter after that.

## Symptoms

A revision draft loads successfully when testing, but Required Parameters aren't satisfied — for example, with a test URL like:

```text theme={null}
https://www.example.com/test?Form_Name__c=Example?utm_source=test&invoca_rev=draft
```

**Applies to:** Invoca Tag

## Cause

The test URL used a `?` query parameter twice.

## Resolution

Only use `?` once, at the very beginning of the query string. Use `&` to separate every parameter after that. The corrected URL would be:

```text theme={null}
https://www.example.com/test?Form_Name__c=Example&utm_source=test&invoca_rev=draft
```

## Where to go next

* [Validating and Troubleshooting Invoca Tags](/s/article/validating-troubleshooting-tags)
* [What Issues Can Occur if the Invoca Tag Is Set to "Page View" Instead of "Dom Ready" in Google Tag Manager?](/s/article/page-view-vs-dom-ready-gtm)