Unable to Share Prototype in XD

Hello Adobe Team,

I'm currently using student plan with Adobe Cloud, and I believe I have access to XD publish services. And I'm also sure I'm using a US Adobe account (I know there's an issue with Chinese Adobe accounts accessing to Adobe Cloud).

Now I'm having problem sharing my prototype. At 50% of the link creating progress, it shows share failed everytime. I read through the troubleshooting post, but none of the solutions matched with what I encounted. The message I got in XD says "We are unable to create the link, due to your storage is full. Please check ‘Published’ online, and delete some links to release some storage space." 

I found it so confusing because my Cloud storage is at 50MB/100GB, and I don't have any published links. I also belive the current Adobe XD version (45.0.62) that I have installed on my laptop is fine too, because I managed to publish a link with a free acount, it succeesfully published. 

Now I don't know where the problem of not being able to publish comes from. I hope this post will be responded to soon.

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By the way, I tried to contact customer service online but the experience this time was very bad. I waited for 40 minutes and still no one answered me.