China is pressuring Uighurs directly, especially when those who are abroad have relatives back home, which makes them more liable to manipulation.
One of the mechanisms China has used is refusing to issue new passports, so when passports expire, it tells these Uighurs to return to China instead of getting a new passport issued in the country of their current residence. These Uighurs then effectively become stateless.
It is highly necessary for countries such as Canada to accept these Uighurs as asylum seekers and grant them asylum, rather than have them return to China. They should be issued foreign passports, which also gives them a stronger foundation. Essentially, any Uighur who is not in China will need to have a foreign passport in order to be better protected. If they do not, they're very vulnerable to various pressures, either by these legal mechanisms or other forms of manipulation.