z/VM CHPID extended_bridged

[speen]

Hello,
I wanna define the chpid for hipersocket as extended_bridged on z/VM, so that I can use hipersocket vswitch.
The problem is, that I can't do dynamic changes, because only z/OS lpar has that rights. I think the only way is to iml the machine, but that is not an option.

I wanna do this:
DEFINE CHPID xx TYPE IQD EXTERNAL_BRIDGED
But first, I need to enable dynamic_I/O changes:
SET DYN ON
I get the msg:
HCPCCO6816E Dynamic I/O changes are not allowed because the
HCPCCO6816E configuration token is not a valid VM token

Do you have any ideas that would help me?
Thank you.