Unable to display WordPress admin bar in the frontend as an admin

This has to do with the core WordPress functionality when you’re working with Multisite and the basic functionality of browser cookies – it’s a security issue.

The WP core team made the decision to set user login cookies for the admin area to be based on the main multisite install. If you want to be logged in on the sub-sites, then you’ll need to log in to each of them individually.

It kinda sucks, but it’s a bit of a security concern, since WP doesn’t know how your multisite is set up, and if they make an assumption about it, then it could be the wrong assumption and therefore opens up a security hole.