A short addendum due to a problem within our circle of friends:
This weekend, while submitting the documents on the BAFA portal, we almost went crazy trying to find the form for the [Verwendungsnachweis] - nothing, nowhere to be found. Originally placed under the last of the three small icons, half a year after our own submission, it was no longer available.
The solution was switching browsers - for some reason, the identical browser that served us everything like clockwork in November blocked us this time.
Chrome - click - done...