Why isn't the Middle East on fire with protest over Xinjiang, given the response to eg Abu Ghraib. It's a similar reason: 1) they know China doesn't care and will disregard their protests or moral condemnations; 2) most countries are terrified of China, in multiple regards; 3) in much of the world, people only respond to events when they're told to - allowed to - by authorities (to protest against China in the Middle East for example, it must be sanctioned by the government or similar controlling power, and no government in the Middle East dares). What about the West, surely Germany or France can stand up to China, right? That's covered by #2, they're afraid of what China will do to them economically, so they limit their criticisms and actions toward China. Suddenly no more BMWs or Mercedes for sale in China. Accordingly mostly what you get is some furious hand waving and stern finger pointing by the UN or EU. As with SARS-CoV-2, in which absolutely nothing will happen to China as a result of what they did.
The US is the only entity that can stand toe to toe with China, as China can splinter any UN or EU response. Ultimately to get some other countries on board, they have to believe the US has their back full-stop. Such that when China starts throwing an inevitable response tantrum, the US will be there to lend unconditional, unflinching support. Who trusts the Trump government's erratic behavior enough to believe that at this point? You have to bet your nation's economic well-being on believing that his administration will have your back if you join the restrain-China coalition. Most countries will naturally avoid taking that risk and will attempt to hedge or dodge the matter. The West will only be able to mount a serious long-term plan once Trump is gone. The powermongers in DC love this style of great power bipolar struggle, a return to the cold war, a very clearly defined giant enemy to focus on; but they can't effectively do anything until Trump is gone, there's too much chaos in the system.
It'll look like this: US + EU + Japan + Britain + South Korea + Canada + Australia + New Zealand + South Korea (along with a few others) working in closer unison, running a program. It's the only approach that can work, China is too big for anything else at this point. China does a thing, the group responds. Huawei is a haphazard trial run; the team is going to have to get into fighting shape, because China isn't messing around, they want the global hegemony crown and total dominance over Asia.