Hi @ES ,
Welcome to our forum!
Do you want to ask users to enter their email password every time outlook starts, right?
If so, based on my research, I found a thread mentioned the similar issue, which introduced several methods to force Outlook to prompt credential. It's suggested that you could try the solutions in this: how to force outlook to prompt for credentials.
Hope to help you! If your case have any updates, please feel free to post back.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.