- Forwarded what DNS - how?
- What domain are you inserting into your mobile device?
- Also, clearly explain how your issue relates to the OpenWrt
- What happens if you remove this configuration that already forwards traffic to the DNS server?
- I assume your server runs DoH?
- Are you running a Kong build?
- Lastly, did you see this part - do you allow for this on your network?
Go figure - if you need in-depth assistance with this, you may wish to make a new thread (i.e. to provide detailed information on your specific issue) - as the OP's issue is solved.