Was signing-up today and noticed this issue.
On page Pricing , the two Buy links are to https://vikunja.cloud/ , which is currently a redirect back to vikunja dot io .
< HTTP/2 302
...
< location: https://vikunja.io
...
<meta http-equiv="refresh" content="0;url='https://vikunja.io'" />
I had to find the link to app dot vikunja dot cloud/?redirectToProvider=true in order to sign-up.
Probably worth fixing, some potential sign-ups might not make it through first-try.
Brett