This tutorial describes how to manually revoke the access permissions that Outlook granted to Hasleo Backup Suite, including deleting the tokens saved by Hasleo Backup Suite. The contents are as follows:
If you no longer want Hasleo Backup Suite to access your Outlook account (e.g., used to send backup notifications), you should revoke its permissions. This prevents the software from reading or sending emails on your behalf. This tutorial shows you how to completely remove access in two steps: revoking permissions via Microsoft's consent management page, and deleting locally stored authentication tokens.
Step 1. Visit https://account.live.com/consent/Manage, sign in with your Microsoft account, and you will see a list of all authorized applications.
Step 2. Locate Hasleo Backup Suite and click "Edit" below it.

Step 3. The permissions you have granted to Hasleo Backup Suite are listed here. Click "Remove these permissions" below to revoke them..

Step 4. Once you have successfully revoked the permissions for Hasleo Backup Suite, it will disappear from the list of apps.

Step 1. In the address bar of File Explorer, directly type %ProgramData%\Hasleo Backup Suite\Email Auth2 to open the folder where the tokens are saved.

Step 2. Locate the file whose name starts with outlook_, followed by your email address, and ends with the .bin extension, then delete that file.

This tutorial provides a detailed description of how to manually revoke the access permissions that Outlook granted to Hasleo Backup Suite, as well as how to manually delete the token files saved by Hasleo Backup Suite.
After revoking the authorization, if you need to grant access again in the future, you can reconnect your Outlook account within the Hasleo Backup Suite software.