ical Google wont work

Dear wp-community,

since last 3 updates, the ical-Download drom “my_calendar”-page wont work. Positively apple sub works since last upgrade again. But if i use Dropdown URL https://www.google.com/calendar/render?cid=https://cosmopolitanschool.de/de/feed/my-calendar-ics/?time=month&yr=2024&month=12&dy=1&nyr=2025&nmonth=1 google calendar shows an error “Unable to add to calendar. Check the URL.”

probably the URL is just wrong?

================ Installation Data ====================
==My Calendar:==
Version: 3.5.20
DB Version: 3.5.11
URI: https://cosmopolitanschool.de/de/willkommen/kalender/
CSS: inherit.css

==WordPress:==
Version: 6.7.1
URL: https://cosmopolitanschool.de
Install: https://cosmopolitanschool.de
Language: de
Charset: UTF-8

==Extra info:==
PHP Version: 7.4.33
DB Version: 5.5.5
DB UTC Offset: +01:00
WP UTC Offset: +01:00
DB Type: InnoDB
Server Software: Apache
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0

==Theme:==
Name: bcs
URI:
Parent:
Version: 1.0

==Active Plugins:==
Advanced Custom Fields: Image Crop Add-on: 1.4.12; https://github.com/andersthorborg/ACF-Image-Crop
Advanced Custom Fields: Table Field: 1.3.26; http://www.johannheyne.de/
Advanced Custom Fields PRO: 6.3.5; https://www.advancedcustomfields.com
All in One SEO: 4.7.6; https://aioseo.com/
Classic Editor: 1.6.7; https://ww.wp.xz.cn/plugins/classic-editor/
Complianz | GDPR/CCPA Cookie Consent: 7.1.5; https://www.ww.wp.xz.cn/plugins/complianz-gdpr
Disable WP Revisions: 1.0.0; https://carlosmr.com/disable-wp-revisions
InfiniteWP - Client: 1.13.1; http://infinitewp.com/
My Calendar - Accessible Event Manager: 3.5.20; https://www.joedolson.com/my-calendar/
Nested Pages: 3.2.9; http://nestedpages.com
PDF Image Generator: 1.5.6; http://web.contempo.jp/weblog/tips/p1522
Polylang: 3.6.5; https://polylang.pro
Polylang Theme Strings: 4.0; http://modeewine.com/en-polylang-theme-strings
Redirection: 5.5.1; https://redirection.me/
Relevanssi: 4.24.2; https://www.relevanssi.com/
Simple Image Sizes: 3.2.3; https://github.com/Rahe/simple-image-sizes
Simple Redirect: 4.0.5;
Yoast Duplicate Post: 4.5; https://yoast.com/wordpress/plugins/duplicate-post/