Antwort auf: Ist es empfehlenswert, die Seed-Phrase einmal einzugeben, um sicherzustellen, dass sie funktioniert?
No part of testing your seed involves entering it on your computer, only on the device itself.
You can either use Ledger’s Recovery Check app (which runs solely on the device): https://support.ledger.com/hc/en-us/articles/360007223753-Recovery-Check
Or completely reset the device and restore your seed again and make sure the same accounts are accessible after you restore.