chore(docs): enhance M365 auth documentation (#8199)

Co-authored-by: Sergio Garcia <hello@mistercloudsec.com>

docs/tutorials/microsoft365/authentication.md

@@ -12,7 +12,7 @@ This allows Prowler to authenticate against Microsoft 365 using the following me
 To launch the tool first you need to specify which method is used through the following flags:
 
 ```console
-# To use service principal (app) authentication and Microsoft user credentials (to use PowerShell)
+# To use service principal (app) authentication and Microsoft user credentials
 prowler m365 --env-auth
 
 # To use service principal authentication
@@ -25,4 +25,4 @@ prowler m365 --az-cli-auth
 prowler m365 --browser-auth --tenant-id "XXXXXXXX"
 ```
 
-To use Prowler you need to set up also the permissions required to access your resources in your Microsoft 365 account, to more details refer to [Requirements](../../getting-started/requirements.md#microsoft-365)
+To use Prowler you need to set up also the permissions required to access your resources in your Microsoft 365 account, to more details refer to [Requirements](../../getting-started/requirements.md#needed-permissions-2)

docs/tutorials/microsoft365/getting-started-m365.md

@@ -253,6 +253,8 @@ This method is not recommended because it requires a user with MFA enabled and M
     - `Client ID`
     - `Tenant ID`
     - `AZURE_CLIENT_SECRET` from earlier
+
+    If you are using user authentication, also add:
     - `M365_USER` the user using the correct assigned domain, more info [here](../../getting-started/requirements.md#service-principal-and-user-credentials-authentication-recommended)
     - `M365_PASSWORD` the password of the user
 

docs/tutorials/prowler-app.md

@@ -170,7 +170,15 @@ By default, the `kubeconfig` file is located at `~/.kube/config`.
 ---
 
 ### **Step 4.5: M365 Credentials**
-For M365, Prowler App uses a service principal application (before we already asked for user and password but now those parameters are optional, they will continue working only if you don't have MFA enabled) to authenticate, for more information about the requirements needed for this provider check this [section](../getting-started/requirements.md#microsoft-365). Also, the detailed steps of how to add this provider to Prowler Cloud and start using it are [here](./microsoft365/getting-started-m365.md).
+For M365, you must enter your Domain ID and choose the authentication method you want to use:
+
+- Service Principal Authentication (Recommended)
+- User Authentication (only works if the user does not have MFA enabled)
+
+???+ note
+    User authentication with M365_USER and M365_PASSWORD is optional and will only work if the account does not enforce MFA.
+
+For full setup instructions and requirements, check the [Microsoft 365 provider requirements](./microsoft365/getting-started-m365.md).
 
 <img src="../../img/m365-credentials.png" alt="Prowler Cloud M365 Credentials" width="700"/>