Incorrect file package - missing imsmanifest.xml or AICC structure

Hello I am having similar issues. I am using Captivate 2019. I finished my course but when I publish it apparently packs it incorrectly and I am not able to upload it to moodle or to scorm cloud. moddle says "incorrect file package - missing imsmanifest.xml or aicc structure" and scorm cloud says "Course import failed: zip file contained no courses".

weirdly, when i have the course open on captivate and clique preview it on scorm cloud it works fine. it also works when i open the htlm file locally here in the browser.

I also tried to send the unpublished version of it to my colleague so he could publish it, but it does not open on his captivate.

could you please shed some light on the issue? i have been stuck at it for weeks.