TLS certificate question about Unbound 1.9.2

[rollingonchrome]

Hello,

I cloned the GitHub repo and compiled Unbound 1.9.2 on a Raspberry Pi.

It is working perfectly as before upgrading from 1.6.0.

However, I was hoping to use a TLS certificate for DoT.

When I uncomment out the following line
in /etc/unbound/unbound.conf.d/pi-hole.conf everything stops working (no
DNS resolution):

tls-cert-bundle: "/etc/ssl/certs/ca-certificates.crt"

Can someone suggest what I might need to do to fix this?

Many thanks,

RoC
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