i had the same, but an hour later, a client ordered weebly, so i had access. but the client cant use the sso login in the product details. alwasys "something went wrong".
via the manage button, i can login and i see his account.
it also created an ftp account for cpanel with credentials and stuff, so far so good.
but..
a) the ftp path is wrong, cpanel does have the pages in /public_html/ folder, not just /
thats the first issue
and the second, as i described above, even the client paid, the sso button doesnt work, no login possible -> client mad and he ordered the second account directly at weebly, so i missed already a sale ;(