I have an issue in creation of test site

Sorry it's a bug. I accidentally removed the test-- prefix from allowed test site prefixes (and kept e2e-test-).

If you create a real site, and type a dummy organization name, then that's the same thing as creating a test site (except that I won't know that it's ok for me to delete it later) .

( & you can use a disposable email service if you want, as long as you can click an email verification link.)