It looks like you have two issues.
The first one is the 5V 5A requirements. Annoyingly, hidden in the manual is...
The Hub draws 5 Amp maximum when both USB ports are drawing 1.8 Amps each.
If you deduct 3.6 from 5 you get 1.4 which is what the AnywhereUSB 2 plus needs to run. From there you need at least 500ma for each USB so Digi recommend a 5VDC 3A psu.
These may be used instead of the recommended power supply kit if USB port charging is not required:
AC Power Supply: US plug to 5 VDC. 2.5 mm locking barrel plug (3 A max). Digi PN 76000934.
AC Power Supply: EU plug to 5 VDC. 2.5 mm locking barrel plug (3 A max). Digi PN 76000935.
AC Power Supply: Standard Temperature, Universal plugs (US, EU, UK, AU) to 5 VDC. 2.5 mm locking barrel plug (3 A max). Digi PN 76002021.
Secondly, the extra card is on Digi manufacturing so I guess tech support is your only path there