Those templates are "supplied" through Adobe Stock. So it will use your creative cloud login to connect. Is anything happen when you click on them? Can you see if you got the relevant info on the right when you do?
They always have loaded very very slooooooowly for me, but still download when I click on them (whatever the status of the thumbnail) maybe it's the same for you?
I have the same issue on my Photoshop 2023 and I went to the Adobe Stock, just to check, and found that it is not available with the standard plan. It means that we need to pay extra to have it. If you download the free templates, they will display.