Error 404

Out of chance, do you have a page named “attivita” too?

No

Hard to say, outside of what the request is for the URL.

I’m assuming that there are published posts in the post type.

Are you willing to try a debugging plugin to get some more information about what’s being done on the URL?

### Begin Custom Post Type UI Debug Info ###

Multisite: No

SITE_URL: https://www.virusfree-europa.com
HOME_URL: https://www.virusfree-europa.com

WordPress Version: 5.4.1
Permalink Structure: /%postname%/
Active Theme: Blocksy Child 1.7.10.1587652230

Registered Post Types: post, page, attachment, revision, nav_menu_item, custom_css, customize_changeset, oembed_cache, user_request, wp_block, elementor_library, amp_validated_url, acf-field-group, acf-field, attivita, listdom-listing, listdom-shortcode, listdom-notification, listdom-search, mgmlp_media_folder, search-filter-widget, elementor_font, elementor_icons

PHP Version: 7.3.17
MySQL Version: 5.7.29
Web Server Info: Apache

Show On Front: page
Page On Front: Homepage (#11)
Page For Posts: Articoli (#193)

WordPress Memory Limit: 40MB

TOTAL PLUGINS: 22

MU PLUGINS: (1)

Aruba WordPress checker: 11

ACTIVE PLUGINS: (18)

Advanced Custom Fields: 5.8.9
AMP: 1.5.3
Blocksy Companion: 1.7.5
Classic Editor: 1.5
Custom Post Type UI: 1.7.4
Duplicate Post: 3.2.4
Elementor: 2.9.8
Elementor Pro: 2.9.3
Lazy Load – Optimize Images: 2.3.2
Listdom: 1.6.0
Listdom Pro: 1.6.0
Loco Translate: 2.3.3
Media Library Folders for WordPress: 5.2.0
Search & Filter Pro: 2.5.0
Smush: 3.6.1
W3 Total Cache: 0.13.3
WP-Optimize – Clean, Compress, Cache: 3.0.19
WPS Hide Login: 1.5.6

INACTIVE PLUGINS: (4)

Glue for Yoast SEO & AMP: 0.6
Media Library Folders for WordPress Reset: 5.2.0
WPML Multilingual CMS: 3.1.9.6
Yoast SEO: 14.0.4

Post Types:
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Taxonomies:
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### End Debug Info ###

I resolved. A plugin causing interference. Thank you.

Awesome to hear you found the conflict.