Can't set up multisies

I went through the process of setting up multisite which worked to an extent – that is I could create my additional sites.

My issue I have a fairly complex set up where I needed to have a non WordPress installation in the root folder, then I need to have WordPress in alias.mysite.com (a physical space on the server), then of course my additional virtual site. This is the only way I can see to create my site set up, which requires a splash page (although perhaps creating a static page may now be a better way)

Despite many attempts I couldn’t get that working, I either received timeout errors, or server can’t resolve to that address.

So what I have tried to do is just move WordPress back to the root to at least get the multisite working in the root folder – and look at just creating a static front page.

Except now I still can’t create additional sites.

I have read most similar threads – and all point to ensuring that wildcard domains are configured – which I’ve done.

I did have a hunch that maybe propagation was an issue as I’d deleted and re-added the wild card sub domain.

Does anybody have any ideas what I may be doing wrong.

Thanks

Chris