We have worked with Workhorse and Ryder who in turn have worked with DHL for US based pilots of electric vans (no fuel cell AFAIK).
Not sure we have worked with any Streetscooter customers - the smaller FC's are more Intelligent Energy(now Ballard?) are of expertese, but them moving into delivery van could have an agreement with PLUG for the main cells and they do the electronics.
Given its the Friday before a holiday I would wait for any PR from PLUG if they are involved to be next week.