Hello @ScottM47 ,
For troubleshooting custom code emails, please call our general support to get transferred to the Tier 2 custom code support team.
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You're welcome to try via the custom code editor, however since the email would be wholly custom-made, our hands would be tied on providing any insight or troubleshooting if the code isn't working as you'd intend.
These articles would likely be the most useful:
Create an email with custom HTML code
Add dynamic links to a custom code email
Using variable tags in Constant Contact email, landing page, and SMS editors
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