I had some questions about the above info, so here's some clarifying information and pictures:
I was trying to differentiate between the built-in Tidal app and the one that you download separately from any A&K Firmware update. The built-in version is updated by A&K and I assume it's updated by A&K during any firmware updates. The other version (aka sideloaded) you have to download separately from a trusted source and install it in the Service folder. You will need to install it, just click on square with the arrow to install. More detailed instructions for the Open App Service is on A&K's website at
https://us.astellnkern.com/blogs/news/open-app-service-instructions
Have you downloaded an updated version of Tidal separately from any firmware updates?
I get my sideloaded version from
www.apkpure.com where the latest version is 2.11.4 - just enter Tidal in search.
To illustrate what I'm writing, in the picture below, you'll see the two application versions - the top app is the A&K installed version and the below that with the version number is the sideloaded one. Just download the updated apk from the link above and move it to the Services folder when your DAP is connected to your computer.
For My Mix, below are some pictures to help put things in context. With the new 2.11.4 version, My Mix is at the top.
Clicking on My Mix goes to this screen:
From here you can create playlists to save offline using steps 1-7 above.
Hope this adds clarity.
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