Thank you @nagex for the confirmation. I suppose I figured out what’s going on. With the Flexible Shipping 4.1.0 update we released in March, 2021 the previous and deprecated Flexible Shipping group shipping methods were replaced with the single ones, using the same mechanisms the default WooCommerce shipping methods use.
I’ve just run a test and it looks like the Germanized plugin recognized the aforementioned group methods and added the Versanddienstleister setting for them:
https://wpdesk.me/ls/rtq45.jpg
However, the same field is not being added for the new single methods. I suppose the problem is the Germanized plugin does not see the Flexible Shipping single methods at the moment and is not recognizing their IDs.
I believe in such case you will need to report it to the Germanized plugin authors and some changes need to be done directly in its code to make the shipping methods be fully recognized.
Kind regards,
?ukasz