HiKay Lambert
Greetings!
Thank you for posting in Microsoft Community.
Upon reading the description you have posted, it seems that you have an issue with Microsoft Office 365 wherein you want to know how to properly setup your icloud account on the Outlook email app.
Here are the steps on how you can properly add your icloud account on your Outlook email app.
Add an iCloud email account to Outlook
These steps are the same whether you're adding your first email account or additional email accounts to Outlook.
- Select File> Add Account.

- Enter your email address and click Connect.

- Enter your name, email address, and password, and click Next.
- If prompted, enter your password again, then select OK> Finishto start using your email account in Outlook.
Outlook won't accept my password
If Outlook won’t accept your password and you know you’re using the password for your email account, you might have an email account that requires additional security.
Gmail, Yahoo, iCloud, Outlook.com, and AOL accounts all use two-factor authentication to help verify that you’re the person trying to access your email account.
To add your email account to Outlook, you’ll need an app password, also known as an application password. This is a different password than your regular email account password. One way you'll know you need an app password is if you see the following message: 2-factor authentication is set up for your account. Please sign in using your application password.
To obtain an app password for your iCloud email account, use the following steps:
- Go to the Apple ID website from your browser and enter your Apple ID and password.

- If you've already turned on two-factor authentication, you'll receive a code on one of your devices. Enter this code to continue. Otherwise, turn on two-factor authentication.

- In the Securitysection, under APP-SPECIFIC PASSWORDS, select Generate Password...
- Enter a name for your password, such as Outlook, and select Create.

- Apple will display an app password for you. Copy this password (without the spaces) and enter this password when Outlook prompts you for a password.

Referenced link: Add an iCloud email account to Outlook - Microsoft Support
Hope this helps,
Sincerely
Khou Sun
Microsoft Community Moderator