Hello Iwan De Dooij,
Thanks for contacting us.
Please make sure that you have selected the correct product identifier in the Import wizard > https://prnt.sc/xz9s3y
SKU is used for new product creation and update of the existing ones and ID can be used only for the update of the existing products.
If the issue will remain, we would investigate this issue on our side. Please contact us via email (firstname.lastname@example.org) and provide us with the following details:
- Store Configuration file (can be found at Store Manager > Preferences(F12) > Save current configuration >> https://www.screencast.com/t/Fdj40Ykd4Z
- import file
- Import configuration file (can be saved on the last step of the import: in icf format > https://www.screencast.com/t/s7voP9mm6
- SKU or ID of the product that can reproduce the issue.
Looking forward to your reply.