Login page form not loading

I am serving 2 websites on a single installation based on a subdirecty user/env/info and a variation on the Learn2 theme.

Everything works fine with one exception, on using login to access a private area in the sub site.
I have one set of plugins and relative symlinks in the folder 'env/info/plugins/ to the base plugins for each plugin used in the subdirectory site.
Each site has its own 'config/plugins/' folder with plugin yaml files
THe login form under the main site works
electricalsafety managment.com/private
However the same under the does not generate the form.
electricalsafetymanagment.com/info/private

It clearly a path issue within the plugin, although the admin login works perfectly (for both sites.)
FYI I tried replacing the symlink to the plugin with the full plugin folder but it did't make a difference

Anybody any ideas where to look.

@Jerry, Not sure if it can have any effect, but your sub site, has pipelining enabled. Don't expect it makes a difference, but excluding any difference always helps when searching for issues...

Also, in plugins/login/templates/partials/login-form.html.twig contains:

<section id="grav-login">

    {% if page.template == 'login' or show_login_form %}

The \<section> is being written, but the rest is not. Add some dumps like {{ dump(page.template) }} and {{ dump(show_login_form) }}

FYI I tried replacing the symlink to the plugin with the full plugin folder but it did’t make a difference

Did your discard the cache?

Thanks for your help.
I did clear the cache.
Also found another minor issue, probably related.
When I save a plugins config in the sub site, I get Successfully save (and it is) but the admin goes to
admin/admin/plugins/...
which gives error 404
Can't trace why.

I can live with that and for now and given up on private section for the subsite