WordPress Website using Formidable plugin plus Amazon AWS to send emails

We're experiencing a "429 Too Many Requests" error when we're trying to send emails through our WordPress website using a plug-in called Formidable. I'm trying to determine whether the error lies with Amazon AWS (where maybe our account isn't set-up to allow emails to be sent in quicker succession) or whether the issue is with the WordPress site's plug-in called Formidable. I only sent out 63 emails yesterday, and received the error message on 29 of them. It ultimately re-tried and sent every one except for one on its own, but this is concerning for when we need to send 1,000+ emails later this year.

Error Message:

Debug Event Details Type Error Date June 21, 2023 at 1:09 pm Content Mailer: Amazon SES Error executing "SendEmail" on https://email.us-west-1.amazonaws.com/v2/email/outbound-emails; AWS HTTP error: Client error: POST https://email.us-west-1.amazonaws.com/v2/email/outbound-emails resulted in a 429 Too Many Requests response: {"message":"Maximum sending rate exceeded."} TooManyRequestsException (client): Maximum sending rate exceeded. - {"message":"Maximum sending rate exceeded."}

Source Formidable Forms /var/www/wp-content/plugins/formidable/classes/models/FrmEmail.php (line: 566)

So I don't know if it deals with that Formidable plugin or that we need to change our Amazon AWS account. If there's something I need to change in our Amazon AWS account, I have no idea what or where. I have never used Amazon AWS before, and the person who set-up our account is no longer with the company, so tag -- I'm it! Please help! Thank you very much!