There's two possible reasons when you get an alert with the message "Could not send message! Rate limit exceeded. We will try again automatically":
Option 1. Other apps (like another help desk app) are connected to your Gmail and Google is throttling your account. You can check for other apps on your account in this link: https://support.google.com/accounts/answer/13533235?hl=en
Ensure you are loggedin with a Workspace admin account. Non-admin users won't be able to see all the connected services.
Filter for "Access to Gmail" in the dropdown:
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Option 2: The message you are replying to has been merged: this is a know issue and should soon be fixed!
If you're still seeing the alert and none of above are true, reach out to karri@commslayer.com and we'll help.