Error unable to connect to Home Assistant started last week

I cannot open Home Assistant on iPad or iPhone. I keep getting “Unable to connect to Home Assistant . Retrying in …. I have no idea what to do or who to contact.

Is this when you are remote or on your own network? Do you have HA exposed externally using something like DuckDNS or Nabu Casa?

We need some more details to be able to help you out here.