Lost ability To connect to Zoho Invoice!

Lost ability To connect to Zoho Invoice!

From the old zoho version: I'm pressing on the little Invoice icon and I'm getting a blank screen.
From new zoho version:  The little 'invoice' icon is not even available.

I can log in to my mail and everything in Mail is working perfectly except for switching to zoho invoice.
To acces my invoices I need to login to zoho Invoice otherwise Invoice is not available through the shortcut.

Any Help?