After updating to 43 my internal IP for HA is shown under “external IP” and when I try to change it to my dynamic dns. http://dynamic dns:8123 it returns an error “response status code was unacceptable: 400” I am not using Nabu casa.
I have not entered anything under “internal IP”
solved by deleting the app and my existing integration for the mobile_app and adding “mobile_app:” to the configuration.yaml.
do you also use “ios:”?
yes I use both at the moment
didn´t fix it for me. the search continues 
I also deleted all entries in the .ios.conf file that was related to the beta app.
Fixed in build 44.
thanks