Title: Plugin Stoped working
Last modified: October 5, 2026

---

# Plugin Stoped working

 *  Resolved [jkuehnis](https://wordpress.org/support/users/jkuehnis/)
 * (@jkuehnis)
 * [4 days, 17 hours ago](https://wordpress.org/support/topic/plugin-stoped-working-10/)
 * Hi,
 * Contact Form 7 forms on my WordPress site no longer submit. After clicking Submit,
   the loading spinner keeps spinning indefinitely.
 * The REST API request returns:
 * POST `/wp-json/contact-form-7/v1/contact-forms/72437/feedback`
 * HTTP 400 Bad Request
 * Response:
 *     ```wp-block-code
       {
         "code": "wpcf7_unit_tag_not_found",
         "message": "There is no valid unit tag.",
         "data": {
           "status": 400
         }
       }
       ```
   
 * The submitted payload does contain a valid-looking unit tag:
 *     ```wp-block-code
       _wpcf7: 72437
       _wpcf7_version: 6.1.7
       _wpcf7_locale: de_DE
       _wpcf7_unit_tag: wpcf7-f72437-p70140-o1
       _wpcf7_container_post: 70140
       ```
   
 * I also checked the DOM. The wrapper ID and hidden `_wpcf7_unit_tag` are identical:
 *     ```wp-block-code
       Wrapper ID: wpcf7-f72437-p70140-o1
       _wpcf7_unit_tag: wpcf7-f72437-p70140-o1
       ```
   
 * Troubleshooting already performed:
    - Disabled WP-Optimize
    - Put Wordfence into Learning Mode
    - Disabled Conditional Fields for Contact Form 7
    - Tested in a private/incognito browser session
    - Created a completely new CF7 test form and a new test page
 * The new test form produces exactly the same `wpcf7_unit_tag_not_found` error,
   so the issue does not appear to be specific to the original form.
 * Contact Form 7 version: 6.1.7
 * Does anyone know what could cause CF7 to reject `_wpcf7_unit_tag` even though
   the unit tag is present in the POST request and matches the form wrapper ID in
   the DOM?
 * Thanks!

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [Takayuki Miyoshi](https://wordpress.org/support/users/takayukister/)
 * (@takayukister)
 * [4 days, 5 hours ago](https://wordpress.org/support/topic/plugin-stoped-working-10/#post-19037281)
 * Where can we see the website in question?
 *  Thread Starter [jkuehnis](https://wordpress.org/support/users/jkuehnis/)
 * (@jkuehnis)
 * [3 days, 18 hours ago](https://wordpress.org/support/topic/plugin-stoped-working-10/#post-19037694)
 * Nevermind…it seems the issue was on the Apache Configuration side ( some wierd
   values on 
   post_max_sizemax_input_varsmemory_limitmax_execution_timeThank you
   a lot for the help and the plugin, i’m using it on a lot of WP Instances since
   years and it works like a charm!

Viewing 2 replies - 1 through 2 (of 2 total)

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 * ![](https://ps.w.org/contact-form-7/assets/icon.svg?rev=2339255)
 * [Contact Form 7](https://wordpress.org/plugins/contact-form-7/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/contact-form-7/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/contact-form-7/)
 * [Active Topics](https://wordpress.org/support/plugin/contact-form-7/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/contact-form-7/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/contact-form-7/reviews/)

 * 2 replies
 * 2 participants
 * Last reply from: [jkuehnis](https://wordpress.org/support/users/jkuehnis/)
 * Last activity: [3 days, 18 hours ago](https://wordpress.org/support/topic/plugin-stoped-working-10/#post-19037694)
 * Status: resolved