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Hi Marcus!
The first thing you should do is enable WP_DEBUG mode on the created staging site following this guide:
https://wp-staging.com/docs/enable-wordpress-debug-log-mode/
Then reload the staging site again, and when you get the fatal error, check this file under the staging site’s directory: (/wp-content/debug.log) and share it with us via this form. I’ve also replied to your email “p***@der-******.de, if you want to reply back to it.
Thanks,
Alaa