Maybe you can create a hotspot with your mobile phone to check how it goes.
I can also remember reported cases, where a metal case blocked the wifi and also the usage of the USB ports interfered with wifi connections (USB3 ports are near the antenna and interfer/disturb the wifi signal)
Well, turns out I have both a metal case and two usb 3.0 connected. 
Does it work if you remove them?
Haven’t tried it yet. It’s hard since I need to have access to it, im not in the same house.
take your time, we are not moving away 
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Assuming the connection is done, how can I bind a particular service to an interface? For example I want to use nodered service only on WiFi and all the other services on lan. Both lan and WiFi are on different networks.
Is this possible?
Yes, should b possible. For example in your node red config you have a the properties uiHost where you can set the IP of the interface where nodered should listen on.
usually all services should be reachable on all interfaces. Or do you like to restrict access?
I want to restrict access because I use vlans. Idea is to have the WiFi interface on iot for node red only. The lan should keep the other services on a different vlan.
maybe you should look into iptable rules
The error status 16 seems to be worked around by adding this modprobe brcmfmac roamoff=1 feature_disable=0x82000
Looks SAE related, but I don’t want to disable it. I’m using WPA2-SAE I guess. So how to apply that fix?
this is a command to be executed. For testing it is ok but might not survive a reboot.
It will definitely not survive a reboot. If it is successful, you can add it to the modprobe configuration.
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This is for seamless switch between multiple APs/repeaters, it seems. Maybe in cases where for whatever reason the adapter has issues cycling through multiple APs? SAE is a method for “Simulations Authentication” in mesh networks, hence in a way related, but it also enhance the security of the authentication process in general. So makes sense to try switching off roaming only first, and SAE only if it still does not work.
I ended up buying a new pi zero 2w just to run this service alone (it’s around 20€ already with case and I have eth adapter so it should be more than fine for what I want). Got tired of trying multiple times without success, I actually suspect that is what @Jappe suggested: I have an aluminum case and 2 USB drives connected and also to help with, the pi is inside a cabinet (but with enough signal anyway) since it’s next to the AP.
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