Alex. You assisted before with this see topic - https://wplms.io/support/forums/topic/external-lms-integration-wplms-shortcode-stopped-working/page/2/
The same issue present its self. I have followed your video to use text editor but still get the error. see screenshot.
This is for course Human exceptionality Unit is named the same shortcode that needs to redirect is [lti-launch id=human-exceptionalities-schools-and-communities]