$ resolvectl query : resolve call failed: DNSSEC validation failed: invalid Test DNSSEC validation by querying a domain with a invalid signature:

If the DNSSEC option is set to true, then DNS resolution will stop working entirely. systemd-resolved may disable DNSSEC after a few unsuccessful validations.systemd issue 10579), you can explicitly disable systemd-resolved's DNSSEC support by setting DNSSEC=false. If your DNS server does not support DNSSEC and you experience problems with the default allow-downgrade mode (e.g.# ln -rsf /run/systemd/resolve/nf /etc/nf To use it, replace /etc/nf with a symbolic link to it: This is the recommended mode of operation that propagates the systemd-resolved managed configuration to all clients. run/systemd/resolve/nf contains the local stub 127.0.0.53 as the only DNS server and a list of search domains. the stub mode which uses /run/systemd/resolve/nf. We will focus here only on the recommended mode, i.e. They are described in systemd-resolved(8) § /ETC/RESOLV.CONF. To provide domain name resolution for software that reads /etc/nf directly, such as web browsers and GnuPG, systemd-resolved has four different modes for handling the file-stub, static, uplink and foreign. Software that relies on glibc's getaddrinfo(3) (or similar) will work out of the box, since, by default, /etc/nf is configured to use nss-resolve(8) if it is available. Tip: To understand the context around the choices and switches, one can turn on detailed debug information for systemd-resolved as described in systemd#Diagnosing a service.

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