we couldn't complete your request right now. Please try again

The issue you're experiencing with your email appears to be related to AWS WorkMail service limitations or restrictions. When you receive the message "We couldn't complete your request right now. Please try again," it typically indicates that there's a temporary problem with sending or accessing emails.

This error can occur for several reasons:

1. Sending limits: AWS WorkMail has daily sending limits, which if exceeded, can prevent you from sending more emails.

2. Account restrictions: Your AWS account may have temporary restrictions applied due to security measures or policy violations.

3. Technical issues: There might be temporary technical problems with the WorkMail service.

To resolve this issue, you can try the following steps:

1. Wait and retry: As the message suggests, try again after a short while. The issue might resolve itself if it's a temporary service problem.

2. Check your sending activity: Ensure you haven't exceeded any daily or hourly email sending limits.

3. Review your account status: Make sure your AWS account is in good standing with no outstanding bills or compliance issues.

4. Contact AWS Support: If the problem persists, reaching out to AWS Support is the best course of action. They can provide specific information about your account status and help resolve any restrictions or technical issues.

5. Consider using an alternative email method: If you need to send urgent emails, you might want to use a different email service temporarily while resolving the issue with AWS.

Remember that AWS Support is the most reliable source for account-specific information and can provide tailored guidance to resolve your email sending issues.
Sources
Undelivered Mail Returned to Sender | AWS re:Post
Email not sending | AWS re:Post