Feedburner does not work after move to new server

[Ferdinand Thommes]

A week ago, I moved my blog (linuxnews.de) to a new server. Since then, users have complained that the feed is not updated. After reading https://www.wpbeginner.com/beginners-guide/how-to-fix-wordpress-feedburner-feeds-not-updating/

and following the advice offered (activate pingshot, resync), resync gave an error that does not help me to further debug the issue: There is an issue that must be addressed with your source feed for the feed "linuxnews.de" What can I do to find and fix my issue?