please check the status of systemctl status pveproxy.service pvestatd.service. Also, are there any errors in the journal? You can get a paged output of the journal since boot in reverse order by running journalctl -b -r
I am sorry for the inconvenience.
Thank you for your answer.
The status of pveproxy.service pvestatd.service was active.
After stopping the server due to a wiring problem at the installation site and starting it up again, I performed VM machine creation again and this time the storage selection screen appeared and it became possible to select.
We will keep an eye on the situation for a while, but if the problem recurs, we will retrieve the journal information.