DoH not working

[YgzNsl]

I've just installed AdGuardHome in my VPS using the provided installation script.
I've valid SSL certificates from Let's Encrypt, and I enabled encryption via admin interface.
I'm not using any reverse proxies.
According to the docs, these should be enough for dns-over-https to work. However, it gives me 400 bad request.

Is there any additional config I must do?

PS: Live website can be checked here: https://dns.yagizunsal.tr/dns-query

[smurfsurfing]

once you have the two pem files. Proceed to configure AGH --> settings / encryption settings, then set the cert path or paste cert in the two boxes. Next just configure your devices to use DoH. For ex. MS Edge
Settings / Privac.... / Use Secure DNS.... / Choose service provider and put in https://dns.yagizunsal.tr/dns-query

That's it