Cannot Open my RSS feed

hi all.
I suddenly having a problem with my rss feed.

I type https://www.ryzalyusoff.com/blog/feed and the browser return me the 404 error.It was fine before, but suddenly out of noweher this problem occur.

I seriously need help here.
The feed is however still can be view by typing https://www.ryzalyusoff.com/blog/?feed=rss2 but that is not i want because i need the original link to be worked so that I could pull my feed into the other site.

Any idea whats going on or how to solve this problem?
I really appreciate any help that you could give me..

Thank you in advance.