Cubase does not find the send/return ping for the Motu M4

I recently purchased a Motu M4. Wave Lab 11 will find and indicate the ms latency for the M4 when two stereo channels are setup in the EXT EFX connection. Great! However Cubase 10.5 and 11 will not.

Anybody else having this problem with Motu devices? I’ve started a ticket with Steinberg but I’m just curious now if it’s only the M4. Motu has shown me that it works in their Digital Performer DAW and now knowing that it works as expected in WL they’re walking away from my problem.

Is there anybody able to use the Ext Efx connection in Cubase using a Motu interface?