There's a law introduced August last year that basically treats app developer like domain registrants by requiring them to register and provide their real contact info and/or company information. Existing apps were given a grace period until Apr this year. It seems that Meta had 7 months to fill out a pretty trivial form but for whatever reason chose not to do so, which is why this is happening.
https://m.163.com/dy/article/J04PDGQA055632BB.html?spss=adap...
https://support.huaweicloud.com/prepare-icp/icp_02_0049.html