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Connecting FT4232H to a Raspberry Pi 4 - no detection

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Astoca:
I was hoping to get
     FT4232H ( USB mini B uart)
     Raspberry Pi Linux raspberrypi 5.10.63-v8+ aarch64 GNU/Linux
     Edit: OS: Debian GNU/Linux, Versiojn=-10 (buster)
working together.

The Linux installation guide suggests if I'm reading it correctly that they expect that Linux will automatically detect and connect FTDI modules.
  https://ftdichip.com/wp-content/uploads/2020/08/AN_220_FTDI_Drivers_Installation_Guide_for_Linux-1.pdf
  page 3:  1.1 "Since the FTDI VCP driver is built into the Linux kernel ... "
       

When I connect the module and type at the terminal
    demsg | grep FTDI

It returns nothing.  In other words, This linux kernel isn't detecting and connecting the FTDI module automatically, and no text in the demsg output contains "FTDI".

I am unsure where to go next with this and was hoping someone might have experience connecting these devices to a Raspberry Pi 4

If I can avoid using the D2xx drivers in favour of built in kernel support (VCP) I'll take the VCP ideally.

FTDI Community:
Hello,

what version of Linux are you using? our Linux VCP drivers can be downloaded from our website https://ftdichip.com/drivers/vcp-drivers/.

are you sure that the FT4232H mini module being powered correctly? depending on the power configuration you are using, there are some external connections needed. Section 3 of the module datasheet explains this https://ftdichip.com/wp-content/uploads/2020/07/DS_FT4232H_Mini_Module.pdf.

Best Regards,

FTDI Community.

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