Firebase Custom Domain 404 Error on subdomain

Question

How do I fix this 404 error on my custom domain name?

At this subdomain https://bookmarked.fun/publicprofile/IanHunter I get a 404 error on my custom domain.
On firebase's app deploy website, I have no issues https://bookmarked-d5236.firebaseapp.com/publicprofile/IanHunter .

Answer 1

Adding in the rewrites to the firebase.json file fixed the routing 404 issue.

{
  "database": {
    "rules": "database.rules.json"
  },
  "hosting": {
    "public": "build",
    "rewrites": [ 
      {"source":"**", "destination": "/index.html"
  }]
  }
}