HTTP GET request producing odd responses for Alura

I have alura membership and using Chrome inspect I found the backdoor API call for keyword search. I perform a HTTP request using get as the option.

If I have a single keyword then I get a good response. But if I have three keywords then I get a response “Similar Keywords process started successfully” or even " You are searching blacklisted keyword". yet if I copy the exact http request and put it directly in Chrome I get the desired results.

Occasionally the keywords do work but it seems very random. I am wondering if I am making too many requests to the API directly?

A typical API request looks like this:

https://alura-api-XXX-uc.a.run.app/api/keywords/Festive%20Gift%20Christmas%20Shot%20Glass/similar?forceUpdate=false&tool=keyword-finder-new&limit=300