"Data submission failed" on PDF larger than 11" x 17"

For new HP PageWide 5100PS MFP (worked on previous 'plotters')

regular iPrint on OES 24.3
Windows 11 23H2 clients, iPrint client v06.24.20

Printing keeps getting a "Data submission failed" when printing large PDFs to the new 'plotter' HP PageWide 5100PS MFP
only with their primary PDFs, while Test prints, normal office sized PDFs appear to work, ACAD plots work just fine.  
a manual direct printer to the printer works fine, only the iPrint printer hits the problem
Using both BlueBeam and Adobe Acrobat for printing.

it appears that PDFs up 11x17 in size are OK, but the iPrint printer fails on larger

doing an iPrint Trace, can't see a reproduction (other than not showing on the printer) until we've done the iprntcfg TRAY_ICON trick (so our trace has two attempts in it)

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Andy of KonecnyConsulting.ca in Toronto
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