WTH, dashboard url needs to contain a hyphen

Why dashboard url needs to contain a hyphen?

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Most of mine are single words. I only need a hyphen when I have more than one word in the URL (e.g living-room). The hyphen replaces any spaces.

Is there a space at the start or end of your URL? If one has been entered by accident then the dialogue is asking you to replace this with a hyphen.

just check for yourself by adding new dashboard. I’m on 2023.7.3
my old dashboards also are one word but by default url was adding lovelace-word so it had a hyphen. But WTH?

I have same problem, my url is regular IP address without hypen not one word
For example for Node-red i have URL: (yes Docker)
With this issue i can’t add this webpage