Below please find the steps to include the hyperlink within an invoice when emailing an invoice from Time and Billing:
Open Time & Billing and select the relevant client to invoice.
Go to Input, click Invoice (WIP).
Complete the various tabs as required.
In the Invoice Summary screen, select the Email Invoice box, and it should populate the client's email address, then click Save.
Select the Post + Email tab.
The screen with the Invoice Number and Invoice date opens. Click OK.
In the Email as PDF Document screen, select the Include hyperlinks box. Note: It's important to include the full address of the linked site.
Click Generate to attach the invoice to an email.

