I arrived in Japan yesterday.
For the Covid related stuff they asked if you had either the MySOS or the VJW filled out. I had the MySOS so used the QR code for that, a screenshot actually not the "live" App.
On the LH flight we still got the paper versions of the Immigration Form and Customs Form, I filled them out just in case, even though I had already done the VJW.
I ended up using the paper version for Imigration and the VJW QR code for Customs.