If you want to see the DNS records as set, you will need to set them to “DNS only”. Note that will send requests direct to Firebase and not through Cloudflare so no Cloudflare protections or features will be applied to the site traffic.
in the report you gave there is a message
“The server rejected the connection with HTTP code 404.”
could it be a problem in my API configuration
I saw that many are using Cloudflare to customize the domain to their API
const functions = require('firebase-functions');
const server = require('./src/server')
const opts = {memory: '1GB', timeoutSeconds: 60};
const api = functions.runWith(opts).https.onRequest(server)
module.exports = {
api
}