No Admin bar on Domain Mapped Sites

Hi guys,
I've had an issue for a long while now, just getting to fix it now.

On the domain mapped sites no admin bar shows.

I'm not sure why it wouldn't be showing?

When i remove the domain mapping and access the site via the third tier domain, the admin bar re-appears.

This makes me wonder what the cause is, if it were a conflict with another plugin, i would think that it wouldn't work either way.

Thanks in advance :slight_smile: