Step1.html HTTP 404 Error

Hello,
I am working on a Keycloak POC and I have successfully created an image and deployed it to an Azure Kubernetes Service cluster.
When I access the app I am prompted to create the admin user (as expected).
I can access Keycloak using localhost:8443 and create the admin account.
I get a 404 error though on the file step1.html when trying to access the admin console.
This is the path that generates the 404 error:
https://localhost:8443/realms/master/protocol/openid-connect/3p-cookies/step1.html?version=56pvt

What am I doing incorrectly???

Dockerfile:

FROM quay.io/keycloak/keycloak:latest

ENV KC_HEALTH_ENABLED=true
ENV KC_METRICS_ENABLED=true
ENV KC_FEATURES=token-exchange
ENV KC_HTTPS_KEY_STORE_FILE=/opt/keycloak/conf/keystore/keystore.jks
ENV KC_HTTPS_KEY_STORE_PASSWORD=th3S3cr3t#
ENV KC_LOG=console,file
ENV KC_LOG_LEVEL=DEBUG
ENV KC_LOG_CONSOLE_COLOR=true
ENV KC_PROXY=passthrough
ENV KC_HTTP_ENABLED=false
ENV KC_PROXY_ADDRESS_FORWARDING=true
ENV KC_HOSTNAME=localhost:8443
ENV KC_HOSTNAME_STRICT=false
ENV KEYCLOAK_ADMIN_URL=/


# Install custom providers
RUN curl -sL https://github.com/aerogear/keycloak-metrics-spi/releases/download/2.5.3/keycloak-metrics-spi-2.5.3.jar -o /opt/keycloak/providers/keycloak-metrics-spi-2.5.3.jar
RUN /opt/keycloak/bin/kc.sh build


ENTRYPOINT ["/opt/keycloak/bin/kc.sh", "start"]