I'm working on a system that creates email templates and approves them via API. We had everything working fine, but last week we started receiving API errors when approving the template. The errors are not really helpful as they are always the 611 - System Error error message.
Here is the one example of a template that is failing: marketo-template.html · GitHub
If I go to Marketo and manually approve the template, it works. Also, if I create a new template with this content and approve it, it also works. It only fails from the API.
Any ideas what could be happening?