Background of the issue:
When a user registers a new account on hidden link in English or German language, the password link in the received email leads to a 404 page. This issue does not occur when a new account is created in the default language NL. I have resaved permalinks but that didn’t solve the issue.
Symptoms:
Password reset link in WooCommerce email leads to a 404 page in secondary languages (English and German).
Questions:
How can I fix the issue where the password reset link in WooCommerce emails leads to a 404 page in secondary languages?
I've changed this on your sandbox site and this also works. So changing that setting on the customer site will not solve the issue and is also a very bad solution since it will break all of the urls.