Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Dear Lacey,
Thanks for your updates and letting us know the current situation in your environment.
May I know whether you just test the flow by clicking on Test>Test Flow>Manually? If yes, no matter you set the add hours and minute or not, the next action such as sending an email will be triggered immediately as a test result.
Regarding "Adding ‘On these days’ Tuesday – no email sent at 7:18 a.m. (Start time)", do you mean that no email is sent after you click on Test to test the flow? If yes, it may be an issue in your environment and I can't reproduce the issue in our environment. If it is convenient, I suggest you contact the administrator to open a support ticket to our related team as soon as possible so that they can help you further investigate the issue.
As another suggestion, I suggest you clear the browser cache and create a new flow to see if the email can be sent after you add the hours and minutes in the newly created flow.
Thanks for your effort and time!
Sincerely,
Cliff | Microsoft Community Moderator