wlan 0 uses the Android system name M9Cmax and MAC B4:04:...
wlan 1 uses systemname LibreELEC and MAC B6:04...
Both are working but only the first connection works.
The WLAN driver graps first the Android conf.
You are right, actually. I missed that and obscured in in my earlier post by copy and paste - this is the same here concerning the difference in the MAC addresses. Now, my Wifi-Scan only picks up the Wifi I called EgoIggo, which is tied to the B4 MAC address - and I can connect (which is more than can be said for the Wetek Play, actually ...). Also, I can browse with the connection, so that seems to be working.
Before, as I can see in my terminal still, tether was tied to the B6 MAC and I could not connect. Now the question is, whether this is random and might change after every reboot - I guess, we will have to see.