TLS handshake failure in .NET MAUI when server chains to Sectigo R46 (worked in Xamarin.Forms)

[JMansel]

Hi all,

We’re seeing a TLS handshake failure in a .NET MAUI app when connecting to an HTTPS endpoint that previously worked in our Xamarin.Forms app.

The server certificate chains to Sectigo Public Server Authentication Root R46.

Behaviour

• Xamarin.Forms: works on Android 11–16 and iOS
• .NET MAUI:
  • Fails on Android 11–14 (net_error -202)
  • Works on Android 16
  • Works on current iOS
• Device browsers (Chrome/Safari) work in all cases
• Same backend, same devices, same network

The only change is Xamarin -> MAUI.

I'm wondering if anyone else has experienced this issue and I have not found anything online specifically related to .NET MAUI.

After a bunch of Googling I understand if we reissue or reconfigure the certificate to chain to USERTrust RSA Certification Authority this should fix it, but I need more concrete proof/evidence that this is the case, specially in the context of XF -> MAUI, and it's not 'an app issue'.

Thanks,
Jamie