Magento 2 - "The value specified in the URL Key field would generate a URL that already exists." even though the value does not exist in url_rewrite

Question

I get "The value specified in the URL Key field would generate a URL that already exists." but I checked the table "url_rewrite" and there is no entry with that key.

The URL is "verbrauchscalculator". If I call the URL in the browser, then a page opens.

There is also no category where the name is "verbrauchscalculator".

What can I do?

Answer 1

run this command to check the record in the table url_rewrite again for sure:

SELECT * FROM `url_rewrite` WHERE `request_path` = 'verbrauchscalculator'

Answer 2

I found the reason why the URL exist. There is a extension with a route which is set to verbrauchscalculator.