I ran if for HTTP and HTTPS, both are working fine.
What may be happening is that these tools that are saying they cannot redirect are being blocked by (Super) Bot Fight Mode or some WAF rule. You need to visit the Dashboard > Security > Events right after placing the requests through these tools to see what feature is blocking them, and then adjust it.
Many thanks for the hint. I did activate some options in Cloudflare and there is no any explicit reference to an 301 redirect error any more. Also, checking on redirect special sites does not result in any error either.
However to be 100 certain, can you advise where to find error log ?
In a case where some redirects were not performing because of settings on Cloudflare, I don’t think there would be any errors logged. But anyway, on a paid plan you can go to Cloudflare Dashboard > Analytics & Logs and filter by status code.
While I could be sceptical about some SEO checking sites, this morning GSC issued a warning. Do you think that Cloudflare could be blocking it as well ?
Search Console has identified that your site is affected by 1 Page indexing issue(s). The following issues were found on your site. We recommend that you fix these issues when possible to enable the best experience and coverage in Google Search.
You should visit Google Search Console documentation to better familiarize yourself with how GSC works. This is unrelated to Cloudflare per se, but may be the result of what you do with Cloudflare as a tool, including redirects you’ve set.