Rate Limit error cause

[QRRV]

I was wondering if this rate limit error is caused by the Mojang API call returning an error, or the mojang-request-limit in the config file being reached. I'm also using the mojang api in one of my plugins, that's why I want to know this.

[QRRV]

Since we are expecting high player counts and depend heavily on FastLogin, is it possible to get in touch over Discord, since that would be easier?
My discord is qrrv.