Thank you Ahtisilli… This is exactly the situation on my 10 II with the two SD cards shown.
I tried chmod and unfortunately that also did not change the situation.
Maybe one possible trace could be the following:
Regarding that path I found the following webpage:
https://source.android.com/docs/core/runtime/boot-image-profiles?hl=en
Might it be possible that the “real” SD card is incorrectly presented by the kernel, so that Spotify cannot recognize it? And why is the internal storage presented as SD card?