Hi @apham ,
Do you want to check if you have received the email with subject "Online" within the past 24 hours?
What is the time that you want to check if you have received the email with subject "Online"?
I have made a test on my side to check if I have received the email with subject "Online" within the past 24 hours at 8:00 every day, and you could refer to screenshot below to create the flow:


Please let me know if your problem could be solved.
Best regards,
Alice
Community Support Team _ Alice Zhang
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.