Pulse Flex 2i as a stereo pair & connection with PC

I have a home office set-up where I want to connect my private mini pc with my two Flex 2i.

The 2 Flex are working as a stereo paired group and when I`m trying to connect with my pc per bluetooth this does not work as a connection with the group "home office" is not possible - I can only connect with one of the two Flex and there is no voice coming out.

Should I instead try to connect with a cable? and does the cable connection provide stereo sound?