Portfolio function broken after DNS reconfig

Hi there, I recently finalised my website and reconfigured the domain and everything is working as it should except that none of the portfolio pages are reachable. The content is still visible via the back end, but all return 404 errors when opened.

I have tried to rename the portfolio slug, but this doesn't appear to help. It seems as though there is a page naming conflict now that my site's primary domain is no longer ytm.wpmudev.host, but youthere.media.

If you could take a look at this for me, I'd be grateful.