Unable to create Cognito User Pool

There appears to be a persistent issue with the creation of a new Cognito User Pool. While just a guess, perhaps the TLD ".pt" is unsupported as an email address specification for verification emails and such.

Steps to reproduce:
Cognito > Manage User Pools > Create a user pool > Step through settings > Selected options "Email address or phone number", "Allow both...", "Email" attribute required > Next step > Next step > Create role (can't select previously created roles?) > Next step > SES Region: US West / FROM email address ARN: hello@hello.pt (verified) / FROM email address and REPLY-TO email address: "Hello hello@hello.pt" > Next step > Next step > Next step > Next step > Create pool > The following error has been copied and pasted as is and the HTML entities are what I see also:

1 validation error detected: Value 'Hello <hello@hello.pt>' at 'emailConfiguration.replyToEmailAddress' failed to satisfy constraint: Member must satisfy regular expression pattern: [\p{L}\p{M}\p{S}\p{N}\p{P}]+@[\p{L}\p{M}\p{S}\p{N}\p{P}]+ (Service: AWSCognitoIdentityProviderService; Status Code: 400; Error Code: InvalidParameterException; Request ID: f1c2d27c-e1ce-4fca-b813-f64051ba32eb)

Based on the errant value mentioned above, "Hello hello@hello.pt" appears to be an undesirable value for "FROM email address" and/or "REPLY-TO email address" inputs on the Manage Customizations page (e.g. https://us-west-2.console.aws.amazon.com/cognito/users/?region=us-west-2#/pool/new/message-customizations). The placeholder value of the "FROM email address" input suggests this format. When I change these values to simply "hello@hello.pt", I receive the following error instead:

Cannot configure From email address for default email configuration (Service: AWSCognitoIdentityProviderService; Status Code: 400; Error Code: InvalidParameterException; Request ID: 3119206a-323d-4bc1-905e-3d865cf7a6b2)

Any help would be much appreciated.