User will not be prompted to to install the Web App

Thank you for this plugin. Still, need some help to solve some errors.

I am running version 0.2-alpha1 on WordPress 5.0.2 and have Twenty Nineteen Default Theme installed and activated.

My site is on an NGINX server using Cloudflare DNS, CDN paused.

I could solve an ‘HTTPS’ error in /wp-admin/options-general.php by setting the ‘Minimum TLS Version’ in Cloudflare (dash.cloudflare.com > Crypto) to 1.2

When auditing my site in Chrome Dev Tools (Lighthouse):
‘User will not be prompted to Install the Web App
Failures: Service worker does not successfully serve the manifest’s start_url, No usable web app manifest found on page.’

I have no explanation for the following:

1. Why is the manifest on my site unusable?

2. ‘Description’ is not getting pulled.

3. Display is ‘minimal-ui, minimal-ui is ‘not supported by Chrome, In order to show the Add to Home Screen Prompt, display must be set to standalone.” https://developers.google.com/web/fundamentals/web-app-manifest/) Is there a way to edit this in the WordPress admin area?

4. Webpagetest shows that the manifest is not getting cached. Is it still valid that the browser should cache the manifest for offline access? (Source: https://www.w3schools.com/tags/att_manifest.asp)

5. In Safari I am getting the error Code ‘Safari cannot open the page. The error: was ‘FtechEVent.respondWith received an error: ReferenceError: Can’t find variable: is StreamingResponses (WebKitServiceWorker:0)” after refreshing.

Thanks for your support.

Best Wishes, Inge

The page I need help with: [log in to see the link]