Hello rancher-users, today i run into a problem where i want to import a fresh installed k3s-cluster to fresh-setup rancher-server (that runs behind an nginx-proxy-manager). Using the register command I face the following problem:

INFO: Value from <http://rancher.dcs.hcu-hamburg.de/v3/settings/cacerts> is an x509 certificate
time="2024-09-01T23:06:49Z" level=info msg="Listening on /tmp/log.sock"
time="2024-09-01T23:06:49Z" level=info msg="Rancher agent version v2.9.1 is starting"
time="2024-09-01T23:06:49Z" level=info msg="Testing connection to <https://rancher.my-domain.com> using trusted certificate authorities within: /etc/kubernetes/ssl/certs/serverca"
time="2024-09-01T23:06:49Z" level=error msg="Could not securely connect to <https://rancher.my-domain.com>: Get \"<https://rancher.my-domain.com>\": tls: failed to verify certificate: x509: certificate signed by unknown authority"

What option do i have, if the proxy-manager uses letsenscrypt?