...
We'll assume you already set up a RADIUS profile for eduroam.
(also see Ubiquiti UniFi OpenRoaming configuration snippet)
Note that Ubiquiti specifies a minimum version of the Network application and AP firmware at their help topic: Setting Up Passpoint on UniFi Network
Currently not all access points (notable U6 Lite) have release firmware available that supports Passpointsupport Passpoint. However, the early access versions of 'UniFi Access Point 6.6.77/6.6.78' should provide this functionality.
The controller will warn you after you select Passpoint if you have selected any APs that don't support it.
You can then either try to update them, or limit the Wi-Fi network to access points that have support for Passpoint.
You will not be able to save the Wi-Fi network if you have any APs without Passpoint support selected.
...