Problem with Remote Access to HA

Hello all,

since yesterday I am a proud owner of a Raspberry Pi 4 running HA.
I now wanted to set up remote access to access my HA on the go.

Unfortunately that does not work.
I did the following steps:

When I’m logging in to HA the certificate isn’t valid and I checked on canyouseeme.org the port 8123 - error (could not see my service).
What am I doing wrong?

Thanks in advance
Chris

Closed as it’s a duplicate post