Adding favicons to Spirit theme

Hi Team,

I am writing to you in regards to an issue I am having trying to add a favicon to my site.

I found instructions on the support forum but for some reason when I go to Appearance>Customise nothing appears for me to complete the remainder of the instructions.

Log into the WordPress Admin.
Click Appearance > Customize.
--Can't complete the remaining steps--
Click Site Identity.
Click Select File under where it says Site Icon.
Once you’ve selected your favicon file, click the Select file button and upload.
Your favicon will appear under the Site Icon heading of the Site Identity dialog.
Click the Save and Publish button.

Is there a bug preventing the upload of favicons on the Spirit theme?