Godaddy Firewall

I created a site on a different host and transferred to GoDaddy for client. Since the transfer to GoDaddy, the RankMath plugin has disappeared and I *think* the underlying redirects may be causing an issue with the blog displaying (I’m getting a 404 for any of the blogs). I’ve tried the solution of whitelisting suggested in another report – but it doesn’t seem to have solved the issue – I still can’t see Rank Math in the WordPress backend. I’m not sure what to do.