What to run
Use Redirect Checker. The result is from Cloudflare.
How to read the result
Each hop has a status, a URL, and a Location.
The stopped reason says whether it finished on a non-redirect, hit a loop, or ran out of hops.
Three or four hops is common. More than that is a smell.
What to open next
Open HTTP Headers on the final URL. That result is from Cloudflare.
If the host on a hop looks wrong, open DNS Lookup. DNS Lookup is DNS-over-HTTPS from the browser and does not follow CNAMEs.