Site Kit - Unable to install tag

Has anyone experienced a problem with the Google Site Kit?
My dashboard says that I can’t install the code.

This happens with WP plugin?
I have this with 1 of 25 websites, don;t know why.
The fastest way is to install the tracking code via the child theme using add_action(‘wp_head’, …

Yes, it happens when I use Google Site Kit plugin.

I was able to get it working by disable all caching plugins, and restart Mencached and Redis services.

Thanks for tip for adding the tracking code.

The Site Kit is not showing a code, I assume you mean the Google Analytics code?

Yes, right. I’m using the plugin mostly for new sites because it’s very quick to add them to GSC en GA as a new profile. If this is a problem for some site I add them manually.