Hello cncfanlar and welcome to WebmasterWorld [webmasterworld.com]

I noticed this link automatically added in the source code of my blog:

That link can create a feed but that is for other readers, news-readers or RSS feed-readers, it doesn't create a sitemap to submit (unless they have changed blogger's defaults). Look through your Blogger settings for their instructions for sitemaps.

It gives a warning that the relevant urls cannot be found. When I try to add it, it gives me a Page redirected error.

If the URLs you are submitting vary from the actual URL of the blog posts, it may be redirecting to the correct URL. If your Blogger blog is hosted at Google (Blogger) you may not have access to your server log files to check and see. If it is hosted on a paid host, you can see the requests and results of each visit in your server logs and check what Google is requesting.

If that is the case, look at your sitemap and make sure the URLs there are in keeping with your Blogger settings. You can visit the sitemap URL they use from your sitemap. When you create a sitemap its location (URL) should be referenced in your robots.txt file - a line like this is typical:

Sitemap: https://example.blogspot.com/sitemap.xml 

If you visit the sitemap listed URL in your browser, it should show you what Google can see from your sitemap. If the URLs they try to visit are different than the actual URLs, it may be automatically redirecting. To control the format of your URLs, you should make sure those sitemap URLs match the actual URLs you see in your browser's address bar.

Keep in mind that Google has slowed the time it takes to index posts so that you may need to check back at a later date. Right now a lot of people are mentioning seeing "Crawled, not indexed" in GSC.

I apologize that this is an incomplete answer because of guessing at the setup. BTW, that Welcome link above offers tips on using the forums' features and settings - finding your way around.

Thank you for your response. I am happy to be among you.

On the plus side: Your robots.txt is fine. If that were the problem, G would tell you explicitly that robots.txt is preventing them from crawling the page. (And will keep complaining about it forever.)

Standard question: when you request one of the affected URLs in your browser, are you taken straight to that URL, exactly as you entered it?

you are not alone. i am also using blogspot for 8 years. And last year, this problem occured. this only shows that google only wants branded big sites and ditching independent small sites. i am sorry but no fix for this.

i am also devastated by google's messy algorithm updates. before, i am receiving 500k visits per month. now only 40k per month.

R.I.P. Blogspot. blogging is dead.