can’t find out metabox in block editor

If you visit

Admin > Broadcast > Maintenance tab > View blog access

and run it for your user, what does it say?

all the user of subsite has the access of main site and subsite (please see the picture below )

https://drive.google.com/file/d/1RK5McEBykFT0137M7VfuVDM9_2gwBm-r/view?usp=sharing

DayinUP -> main site
hefi -> subsite

So the users have access. Good.

Are the BC custom post type settings correct? It should be one post type per line, without commas.

If that’s fine, then maybe it’s a plugin that is conflicting?

Thank you !

please see the post type setting as below . Is it correct?
https://drive.google.com/file/d/13tJp-1-YUiFdDru_RT4Sqpqr4hkfnL-Z/view?usp=sharing

And I’ve uninstalled all the plugin and it still doesn’t work. could it be another reason causing this situation?

That looks fine to me.

The next question is whether there perhaps is a conflicting plugin? Something that controls which meta boxes are visible.

Other than that, I’m kinda at a loss.