Hi @Aaron Tymo
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to accept the answer.
**Ask:**How to add custom MailFrom Addresses to Azure Communication Service Email
I was able to resolve my issue by requesting a rate limit increase through Azure support.
Please don’t forget to Accept Answer
and Yes
for "was this answer helpful" wherever the information provided helps you, this can be beneficial to other community members.