Problem with android devices to resolve internal DNS

I am taking my first steps configuring ZERO TRUST, I have configured a tunnel with the cloudflared agent towards my internal networks, add all my internal ranges within divided tunnels (allow), also add within Local Domain Fallback my internal domain towards my internal dns . If I am on a PC with the client installed, everything works perfectly, I can access the internal resources by specifying the dns names of my organization and the internal dns resolves me correctly, but when it comes to my mobile device, which is installed and configured with the same user the resolution does not work. Could someone give me a hand with this. Thank you so much. Raul.