Hello admin,
I have now extended the support.
I have deactivated each plugin that was not on the list of required plugins in the documentation which did not help (with the exception of: Akismet Anti-Spam, Google Analytics for WordPress by MonsterInsights, Jetpack, NextGEN Gallery,
Really Simple SSL, Shortcode Widget, Site Kit by Google – these are either common plugins (such as google, analytics and antispam) or would seriously impact the functionality of my website (ssl, nextgen gallery+shortcode widget).
What are my next options to make this work?
Thank you