Subscribe function is not working

Thank you very much for this wonderful calendar plugin, it looks amazing 🙂

After setting up the calendar at: https://woffm.de/events/, I am now trying to get the “Subscribe” function to work. Importing single events to my local calendar is working perfectly, but subscribing to the complete calendar is sadly not working at all.

I am trying to get it working on my mobile phone (iPhone).

When I am clicking “Subscribe” -> “Google”, I am getting redirected to the Google Calendar (where I am logged in), but a notification shows me that the URL is invalid.

When I am clicking “Subscribe” -> “iCal” (which would be my preferred method), nothing is happening at all.

================ Installation Data ====================
==My Calendar:==
Version: 3.6.7
DB Version: 3.6.7
URI:
CSS: dark.css

==WordPress:==
Version: 6.8.2
URL: https://woffm.de
Install: https://woffm.de
Language: de
Charset: UTF-8

==Extra info:==
PHP Version: 8.1.33
DB Version: 5.7.42
DB UTC Offset: +02:00
WP UTC Offset: +02:00
DB Type: InnoDB
Server Software: Apache/2.4.63 (Unix)
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

==Theme:==
Name: Hello elementor Child
URI:
Parent: hello-elementor
Version: 1.0

==Active Plugins:==
Complianz | GDPR/CCPA Cookie Consent: 7.4.1; https://www.ww.wp.xz.cn/plugins/complianz-gdpr
Disable XML-RPC: 1.0.1; http://www.philerb.com/wp-plugins/
Duplicator Pro: 4.5.21.5; https://duplicator.com/
Elementor: 3.30.3; https://elementor.com/?utm_source=wp-plugins&utm_campaign=plugin-uri&utm_medium=wp-dash
Elementor Pro: 3.30.1; https://go.elementor.com/wp-dash-wp-plugins-author-uri/
Essential Addons for Elementor: 6.2.1; https://essential-addons.com/
FileBird Lite: 6.4.7; https://ninjateam.org/wordpress-media-library-folders/
File Upload Types by WPForms: 1.5.0; https://wpforms.com
Flow-Flow: 4.9.0; social-streams.com
ICS Calendar: 11.5.13; https://icscalendar.com
Jeg Elementor Kit: 2.6.13; http://jegtheme.com/
Make Column Clickable Elementor: 1.4.0; https://fernandoacosta.net/make-column-clickable-elementor
My Calendar - Accessible Event Manager: 3.6.7; https://www.joedolson.com/my-calendar/
PDF viewer for Elementor & Gutenberg: 1.3.2; https://github.com/kazbekkadalashvili/pdfjs-viewer-for-elementor
Rank Math SEO: 1.0.249; https://rankmath.com/
Template Kit Import: 1.0.16;
Yoast Duplicate Post: 4.5; https://yoast.com/wordpress/plugins/duplicate-post/