Macs support AVB.
While this is correct, it does not guarantee interoperability. To achieve interoperability, vendors have to agree more specifically on what types of streams to support and a whole lot more. MILAN is the most promising common ground, however it is not fully implemented by Apple at this time (even though there is big progress).
For example, the "Acquire Entity" command that macOS sends to the M-32 AD when you check "M-32 AD Pro" in the Audio MIDI Setup > Network Device Browser:
[...the device] shall not implement the ACQUIRE_ENTITY command (NOT_IMPLEMENTED shall be returned).
MILAN does not support that. However, under the hood, macOS* does support different types of stream formats (lately including the MILAN AAF stream formats!), I/O configurations, and other features required by MILAN. Hopefully those will become easily accessible - ie. not requiring terminal commands and a controller app without app icon - with one of the next macOS versions.
We see the MILAN interoperability layer as the only right solution for AVB and cannot implement AVB differently for individual vendors.
Apart from all that - a few notes:
1) are you using a switch or are you connecting directly?
2) could you set the stream formats in the M-32 AD to 8 Ch. AM824 and try again?
3) Who is clock master? Have you tried setting the other entity as master?
4) Since mac does not support 44.1, it all hast to be 48/96/192
*with the network adapters that you mention, also the Sonnet Solo 10G after a firmware update that is unfortunately only available for Windows[!]