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You will need to copy and paste this link into your email signature block. Notice that the email below gives direction to the recipient that than need to “click on the secure link below”…
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Tips: If you use a different type of email application other than Outlook these instructions are included. (Just scroll down to find Outlook as this link lists many application instructions)
Here are the instructions for email signature block in outlook: https://support.office.com/en-us/article/create-and-add-a-signature-to-messages-8ee5d4f4-68fd-464a-a1c1-0e1c80bb27f2