I see the same thing as @AyudaRubio I can navigate the app if INGRESS_USER: admin, but adding a child gives me one of two CSRF errors.
When my configuration is set to:
CSRF_TRUSTED_ORIGINS: >-
https://<redacted>.ui.nabu.casa,http://homeassistant.local:8123
INGRESS_USER: admin
log_level: debug
I get this screen:
When I tweak my configuration by wrapping the value of CSRF_TRUSTED_ORIGINS in quotes, I get a screen similar to @jfpalomeque