All my pages have canonical except home page. I still get Duplicate, submitted URL not selected as canonical

Question

In my website, All other pages have canonical urls in the head section like so:

<link rel="canonical" href="https://example.com/" />

The only page without canonical is the home page '/'

When I go to google search console, I keep getting this error:

URL is not on Google

Duplicate, submitted URL not selected as canonical

Discovery
Sitemaps
https://example.com/sitemap.xml
Referring page
None detected

Every time I fetch, I hope it will get fix but not happening. Should I add canonical on the home page too pointing itself?

Answer 1

Finally I see the message: URL is on Google

My site is a local business site with static pages for products, services, about etc. They have somehow similar content but not exactly. Here is what I did to fix:

• Added canonical link on all pages including home page
• All those canonical links are pointing to home page 'domain.com/'
• Resubmitted the sitemap
• After about 2 hours, when I ran the URL Inspection test, It was showing its is in google index.

Canonical link in the head section of all pages:

<link rel="canonical" href="https://example.com/" />

UPDATE: I have added canonical url on each pages including home page. All of them point to itself. I am doing this because I don't have duplicate content. Few pages are already showing up in google search on page 1/2