Why can I only send 100 emails from Google Sheets?

Please, can somebody explain why I can only send 100 emails a day even though I am a G-suite upgraded user that’s already passed the free trial account? Even if I was still on a free trial account, that limit should be 500.

Will reward anyone that can answer this as I have been stuck for some time now and no one seems to know and Google support doesn’t help with API.