Yoast work only on the main site from a WordPress multisite

I have a Multisite installation with subdomains and it seems that yoast has problems only in the secondary sites (site_id 2,3,4 etc … etc …).
in the single post in the tabs “Seo”, “Readability” and “Social” (I have the active PRO version) all the info are missing.

The problem is also with the free version of the plugin.
How can I solve the problem?
What kind of information do you need to fix the bug?

I did a test even with a default theme and no active plugins apart from Seo Yoast, but the problem does not disappear.

It is urgent enough for us to solve the problem.
Thanks in advance.