IdentityServer4 only authenticates localhost

This may be related to my other question here however because of that it is hard to know.

I am hosting IdentityServer4 and it seems to be working perfectly if all requests are coming from localhost. Anything else it is rejecting however I can log in fine through the web interface.

I am still in development and I am just testing things however I am using

AddDeveloperSigningCredential()

Is this the problem?

IdentityServer4 only authenticates localhost