This was posted in the wrong place so I've created this thread to help member hejdzso.

hejdzso, post: 294864, member: 14290"]Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter does not work! HELP!
iMac Retina 5K, 27 "-inch, 2017

Processor 4.2 GHz Intel i7

macOS High Sierra version 10.13.1

4x USB 3.0, 2x Thunderbolt 3 (USB-C) - I have this kind of iMac.

Apollo Twin Mk II Thunderbolt Audio Interface tried to connect MMEL2ZM / Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter!

Failed!

I tried and did not connect to the Apollo Twin Mk II Thunderbolt Audio Interface for iMac.

I would like to ask for help!

Thank you for your help!
not connected

I can not speak English, I write it with a translation program!

 

Is the cable original?

 

Absolutely original!
I do not know if anything else can be obtained.
So original!
https://www.apple.com/hu/shop/product/MMEL2ZM/A/thunderbolt-3-usb-c-–-thunderbolt-2-adapter
Thanks for the help that this post was created by someone!
Unfortunately I could not figure out how to open a new post!
And what's important!
I can not speak English!
I'm writing everything with a Google translation program.
Thanks for all your help!
The interesting phenomenon is the following!
In the "System Report" the "Porton" shows that you see Apollo.
But in the following picture you can see it as "Plugin" you can not see!

 

Just for the heck of it try a SMC reset of your mac. I had a no work problem with my TB 2 to 3 adapted UAD last night and it turned out to be fixed by the SMC reset.