I have a content type for which I have specified a detail page and URLMapPattern but for the URL pattern the detail page 404 found error occurs. The detail page also exists.
Detail Page: //demo.dotcms.com/Platform-Technology/Promotions/promotion-details
URL Pattern: /Platform-Technology/Promotions/{urlTitle}
And on the content the following tag has been added:
but in browser for Platform-Technology/Promotions/demo-promotion-1 Page not found 404 error
There are a number of things that could cause this problem, most likely related to the details of how you've implemented either the URL Maps themselves, or how you're attempting to access the URL Mapped content URL.
If none of this helps, I suggest you provide more details (such as your full Content Type field list, your full Content Type properties, and the full properties of the content item, and the full URL you're using including the leading "http://"). And considering posting in the dotCMS community forum, since there are more active dotCMS users there who may be able to help.