Lighthouse PWA Audit fail "does not register a service worker that controls page and start_url"

I am getting the above failure in my lighthouse audit. Having looked through SO and here it "should" be working.

There are no errors in the console.

This is the Manifest: -

{
"short_name": "Brotkrumen",
"name": "Brotkrumen Web App",
"description": "Native Background Geolocation POC",
"icons": [
{
  "src": "gingerbreadhouse.png",
  "sizes": "48x48 128x128 144x144 192x192 512x512",
  "type": "image/png"
}
],
"start_url": "/TravelManager.html",
"background_color": "#00ccdd",
"theme_color": "#00ccdd",
"display": "fullscreen"
 }

This is the ServiceWorker code: -

'use strict';
 /* identification division.
  * program-id.    echo.
  * author.        Richard Maher.
  */

var   doryRegister  = [];            // Meet someone new every day.
const INTRO         = "GrussGott";   // Tell clients we're new.
const FLEET_MANAGER = "/Fleet/Move"; // Starship control.
const CACHE_NAME    = "BrotkrumenV1.0"
    
self.addEventListener('install',
function (e) {
    e.waitUntil(
        caches.open(CACHE_NAME).then(function (cache) {
            return cache.addAll([
                '/TravelManager.html',
                '/hg.png',
                '/gingerbreadhouse.png',
                '/striped-witch-hat.png',
                '/brotkrumen.css',
                '/echo.js',
                '/registerserviceworker.js',
                '/brotkrumen.json',
                '/TravelManagerPolyfill.js',
                '/HandleMap.js'
            ]).then(() => self.skipWaiting());
        })
    );
});

self.addEventListener('activate', function(e) 
{
    e.waitUntil(
        caches.keys().then((keyList) => {
            return Promise.all(keyList.map((key) => {
                if (key !== CACHE_NAME) {
                    console.log('Removing cache', key);
                    return caches.delete(key);
                }
            }));
        })
    );

    e.waitUntil(self.clients.claim());
});

self.addEventListener('fetch', function (e) {

    console.log(e.request.url);
    if (e.request.url.startsWith(self.location.origin)) {
        e.respondWith(

            caches.match(e.request).then(function (response) {
                console.log("Request " + e.request.url);
                if (response) {
                    console.log("Response " + response.url);
                    if (e.request.cache === 'only-if-cached') {
                        e.request.mode = 'same-origin'
                    }
                } else
                    console.log("No MATCH");

                return response || fetch(e.request);

            })

        );
    }
    return fetch(e.request);
});

from Lighthouse PWA Audit fail "does not register a service worker that controls page and start_url"