Prometheus failing on some AWS EC2 machine

After enabling the addon on AWS, the service seems to be stuck:

kubectl logs prometheus-operator-84c6fd4988-khdld -n monitoring

E1003 02:41:03.161196       1 reflector.go:134] github.com/coreos/prometheus-operator/pkg/prometheus/operator.go:399: Failed to list *v1beta2.StatefulSet: the server could not find the requested resource
E1003 02:41:03.161982       1 reflector.go:134] github.com/coreos/prometheus-operator/pkg/alertmanager/operator.go:233: Failed to list *v1beta2.StatefulSet: the server could not find the requested resource
E1003 02:41:04.162201       1 reflector.go:134] github.com/coreos/prometheus-operator/pkg/prometheus/operator.go:399: Failed to list *v1beta2.StatefulSet: the server could not find the requested resource
E1003 02:41:04.163077       1 reflector.go:134] github.com/coreos/prometheus-operator/pkg/alertmanager/operator.go:233: Failed to list *v1beta2.StatefulSet: the server could not find the requested resource
E1003 02:41:05.163200       1 reflector.go:134] github.com/coreos/prometheus-operator/pkg/prometheus/operator.go:399: Failed to list *v1beta2.StatefulSet: the server could not find the requested resource
E1003 02:41:05.164053       1 reflector.go:134] github.com/coreos/prometheus-operator/pkg/alertmanager/operator.go:233: Failed to list *v1beta2.StatefulSet: the server could not find the requested resource
E1003 02:41:06.164138       1 reflector.go:134] github.com/coreos/prometheus-operator/pkg/prometheus/operator.go:399: Failed to list *v1beta2.StatefulSet: the server could not find the requested resource
E1003 02:41:06.165006       1 reflector.go:134] github.com/coreos/prometheus-operator/pkg/alertmanager/operator.go:233: Failed to list *v1beta2.StatefulSet: the server could not find the requested resource

kubectl logs prometheus-adapter-66d74c78bd-r24cd -n monitoring

W1003 02:42:03.593889       1 x509.go:172] x509: subject with cn=127.0.0.1 is not in the allowed list: [front-proxy-client]
W1003 02:42:17.373496       1 x509.go:172] x509: subject with cn=127.0.0.1 is not in the allowed list: [front-proxy-client]
W1003 02:42:23.322337       1 x509.go:172] x509: subject with cn=127.0.0.1 is not in the allowed list: [front-proxy-client]
W1003 02:42:32.591538       1 x509.go:172] x509: subject with cn=127.0.0.1 is not in the allowed list: [front-proxy-client]
W1003 02:42:32.595793       1 x509.go:172] x509: subject with cn=127.0.0.1 is not in the allowed list: [front-proxy-client]
W1003 02:42:32.596412       1 x509.go:172] x509: subject with cn=127.0.0.1 is not in the allowed list: [front-proxy-client]
W1003 02:42:32.596872       1 x509.go:172] x509: subject with cn=127.0.0.1 is not in the allowed list: [front-proxy-client]
W1003 02:42:32.597339       1 x509.go:172] x509: subject with cn=127.0.0.1 is not in the allowed list: [front-proxy-client]

Does anyone has an idea on what would cause this?