Zoho CRM import/sync with Zoho Invoices

Zoho CRM import/sync with Zoho Invoices

Trying to follow the instructions to import/sync data from CRM to Invoices and it doesn't seem to work. After entering e-mail and ZSC key it redirects me to the "Welcome to Zoho Invoice page with an error at the top of the page in pink that says:  This link appears to be broken. Contact support@zohoinvoice.com for assistance.