Acknowledging the report
EmailSubject: Thanks for reporting the [short bug description] issue
Hi [Customer name],
Thanks for flagging this. I was able to reproduce it on our side: [one-line description of the bug].
I've passed it to our engineers with your example attached. I can't promise a date yet, but I'll write to you as soon as a fix is out.
In the meantime, [workaround, if there is one] should get you unblocked.
[Agent name]