I tried voice assist for first time and something isn't right now

Hi all
yesterday I followed this guide to test the voice assist. Since I don’t have a camera or atom speaker (I haven’t received it yet) I tried to connect an old phone as per instructions.

In the begging it did worked, (I could ask the time and got an answer for example) and I tried to change the language in Greek, and the problems started. HA was not responded at all so I had to unplugged it. This happened for second time later so I uninstalled everything.

Now I want to try it again, but I noticed that Assist (photo below) it has only one conversation agent (yesterday if I recall correct it was 3 or 4)

image

and the star below was yellow (I think) but now it is grayed.

If I try to add another assist again I have only Home Assistant agent.
Is that correct? Is there a way to add the previous agents?