Fail to access online storage (new business account)

Dear All,

I've assigned a new user license in order to use Adobe Acrobat DC. But when he click the creative cloud icon it complain cannot access online storage, also I think why he cannot request signature from his supervisor because the document cannot upload to cloud.

I've re-installed the Adobe Acrobat DC but still got the same result, any idea how to fix this?

Thanks in advance.

Best Regards,