[com.fabernovel.ratp ] Bonjour RATP NFC tickets don't work with MicroG (even with root hidden)

Affected app
Name: Bonjour RATP / IDF Mobilités
Package id: com.fabernovel.ratp / com.applidium.vianavigo

Describe the bug
(Bonjour RATP and IDF Mobilités are apps for parisian public transports)
The behavior of both applications is the same, it is very highly probable that they use the same method of verification. It is impossible to buy and use any NFC tickets. Even with hiding the root, they both give this message : "Une erreur est survenue, merci de vérifier votre connexion réseau et réessayer" = "An error occured, please check your network connection and retry." I tested this error on multiple phones with multiple custom ROMs and Android versions, see below.
It is the only apps to my knowledge to do this. Other NFC apps, like payment apps for my bank work perfectly once the root is hidden using Lsposed + Shamiko + Magisk. But not these ones. I found no information on this. Maybe some other apps for other countries are using similar verifications, but I couln't find one. I would be very happy for any answer and any help. Have a great day.

To Reproduce
Steps to reproduce the behavior:

1. Install one of these apps
2. Do the initial configuration / Give all permissions asked
3. Go to "Titres" (= Tickets)
4. See the error

Expected behavior
Apps should allow me to purchase and use NFC tickets

Screenshots

System
Android Version: 13 & 12.1
Custom ROM: crDroid 8.8, crDroid 9.1, ArrowOS

microG
microG Core version: 0.2.27.223616
microG Self-Check results: All ticked

Additional context
Any help is welcome, if experts see this, don't hesitate to try by yourself and tell if you get similar results. I would love hearing from you and help other people that will have this problem (because it will happen to everyone who uses microG and parisian transports)

Start by reproducing the failure in Bonjour RATP or IDF Mobilités using the listed Android versions, custom ROMs, and microG version, then compare behavior with root hidden. The issue names no repository files or tests; done would require identifying the compatibility cause and allowing NFC ticket purchase and use without the reported network error.