MARISOLTREND review for TikTok

I've been trying to sync my products for days, and it simply won't sync at all. It won't even load my catalog, so I can't do anything. It just shows me the error code "Request failed with status code 504," but I've checked my connection, cleared caches, tried from other devices and networks... and it still doesn't work. The worst part is that they don't offer any solutions.