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I was using this code for the SKU - "NFPA_1033_Fire_Investigation_Course"

I changed it to the course id as you suggested and that worked. Thanks! Does this mean the SKU can only be the course id?

Also, what is the best way to send you a private note about something?

> I changed it to the course id as you suggested and that worked. Thanks! Does this mean the SKU can only be the course id?

Yes. Joomdle uses SKU field to connect product with Moodle course, so it cannot be changed after creating products.

> Also, what is the best way to send you a private note about something?

Direct email. You have mine already