when I try to record anything in Rank Math I get a 404 Not Found error

Good afternoon,

For a few days, I have been trying to modify some options in Rank Math and I always get a 404 Not Found error, which is observed on my website: https://saludyvidapremium.com.
No matter what you try to modify, I always get the same error.
I already tried to disable the plugins one by one and leave only Rank Math and nothing works.
I already did everything I found in the forums, about rebuilding the tables, uploading the sentence through Fragments, etc.
Nothing seems to work, which I find frustrating.
I would appreciate if you could help me solve this error, because I would like to try the plugin and maybe buy the PRO version, but in this way impossible.
I stay tuned, thank you.