There aren't that many of us with an M32Pro out there, yet...

In the case the DAW didn't receive audio, was that on particular machines, or did it refuse in 50% of the cases on the same machine?

In case it's 50% of the Macs, did you check mic settings in System preferences/Security & privacy?

Did it occur on machines with a USB-C to ethernet adapter? Which adapter?

The first generation ethernet to USB-C adapter from Apple was OK. The second one wasn't. It didn't support ethernet booting, or promiscuous mode. Unfortunately, Apple didn't even change product numbers going from gen 1 to gen 2.

That's beginning to smell like a defective M32...

Hi Max,
thank you for your answer and sorry for the late reply. I haven't really working with this stuff (due to known reason :-))

ad 1) are you using a switch or are you connecting directly?
directly

ad 2) could you set the stream formats in the M-32 AD to 8 Ch. AM824 and try again?
It took me about 4 hours :-( M-32 kept saying that it is connected on an AVDECC already... after several attempts including the apple avbutil I could set it to this setting. But still the same result: The m-32 received audio but nothing arrived at the daw (I tried logic, dip Quattro & wavelab)

ad 3) Who is clock master? Have you tried setting the other entity as master?
m-32 local, set to 96 kHz

ad4) Since mac does not support 44.1, it all hast to be 48/96/192
this is the first time I hear this. But anyways. I tried it with 96 kHz.

But it found out that it works after using the digiface avb in between (m-32 to digiface avb to mac). I guess the digiface AVB has some healing power :-)
Serious: Now I can hook up the m-32 directly on the network interface on my Mac and it just works... However in between I had the same issues as before. I tried it again with the the digiface avb in between. And now it works again without the digiface avb... this is kind of crazy...

I made it :-) months later.
Just for those who would like to hook up a m32ad pro (and I guess the 1610 as well) to a Mac running Catalina or Big Sur without digiface avb.. (Digiface AVB doesn't work with Mac OS Big Sur at the moment...)

1. Decide your Samplerate (48, 96 or 192 kHz)
2. hook up the m32ad pro per ethernet to you avb compatible ethernet port. (Mac Pro trash can support this; otherwise the old thunderbolt to ethernet adapter works as well)
3. Open "Audio Midi"
4. Press cmd-4 --> audio network devices...
5. See if your RME device is there
6. make sure it is not selected (check mark is off)
7. open terminal and write "avbutil --controller"
8.press cmd-2 --> virtual audio configuration
9. select your ethernet adapter with a check mark
10. press cmd-4 --> connection matrix
11. press cmd-3 --> ACDECC controller
12. in AVDECC controller
a) select your Mac
b) in configuration name select: "32 In, 32 Out, 8ch streams" (or whatever fits for you)
c) choose the correct sample rate
d) clock source: Audio Input Stream 1
e) for all input streams "IEC 61883-6 AM8-24 "correct Samplerate"..."
f) Media Clock Input Stream (I didn't manage this but it seems it doesn't have any affects)
g) for all output streams "IEC 61883-6 AM8-24 "correct Samplerate"..."
h) select now in the same window your RME device
i) set the correct sample rate
j) clock source: Internal
k) select for all Input and Outputstreams "IEC 61883-6 AM8-24 sampling rate"
13) See how in the routing matrix window (cmd-4) the routing field turn green
14) right click in  the routing matrix in the right crossing field (e.g. Mac Pro Input Stream 1 / m32ad Output Stream 1) and click the refresh fields
15) check in audio midi, if your Mac is available as an input device
16) open logic or whatever, choose your Mac as an Input device in audio settings
17) choose the right channel
18.) Voila :-)

Actually it should work without the routing. But for me  this was the only way how it worked.
Afterwards everything works flawless (if you keep the sample frequency...)

Best regards, Marcus

Hi Max,
sorry for late reply... but this always takes some time...

> Some questions:
> - you tested this without using a switch, correct? Just a direct connection to the M-32 AD Pro.
Yes. Direct connection between m32 AD pro and Mac Pro.

> - did you try using AAF formats?
I tried it several times today. In the "AVDECC Einheiten Controller" I could change Input Format to AAF streams for the Mac.
When I tried to change the m32 output streams to this format I always got an error message like: "The Controller sent a command that requires the stream(s) to not be running but there are streams still running." Even though I made sure that the routing matrix has no active routings :-(

> - did you try other configurations, ie. with a higher channel count?
The Mac did let me select higher channel counts (e.g.  64 in, 64 out 8 channel streams or  64 in, 64 out 32 channel streams)
However as soon as I want to set up the m32 AD pro to these settings. I get the above error message :-(
Btw. the Mac seems to be limited to 64 in and 64 out. I didn't find any configuration with 128 ins and out...
Best regards, Marcus

Hi Marc,
thank you for your post. It helped :-)
Hive on Mac just works together with the m32 AD pro. I tried AAF streams and the IEF... AMO whatever streams and both worked. 
For everybody who uses a Mac:
- just download hive for Mac
- open it and select "Mac native" support from preferences
- wait a second (it takes about 10 seconds until the m32 ad pro shows up
- make sure to use 48, 96 or 192 kHz
- select the same stream formats for the m32 ad pro output streams and the Mac input streams
- click on the correct routing points (Output stream 1 of the m32 to the Input Stream 1 of the Mac and so on)
--> enjoy fantastic sound quality, long and thin cables and a robust connection without additional box :-)

Marcus