How to use access token for Microsoft graph API?

Question

Here are the methods I tried using the Microsoft Graph API and their respective outcomes:

Method 1:
- After Single Sign-On (SSO), we obtain an access token.
- This access token is used as a bearer token for Graph API integration.
- Resulted in the following error:
  - URL: https://graph.microsoft.com/v1.0/me/onenote/pages
  - Response:
    - Error Code: 40001
    - Error Message: "The request does not contain a valid authentication token."
  - URL: https://graph.microsoft.com/v1.0/users/gowrishankari97@outlook.com/events
  - Response:
    - Error Code: ErrorAccessDenied
    - Error Message: "Access is denied. Check credentials and try again."

Method 2:
- Obtaining an access token based on the tenant ID and specified parameters.
- Using the obtained access token.
- Resulted in the following errors:
  - URL: https://graph.microsoft.com/v1.0/me/events
    - Response:
      - Error Code: BadRequest
      - Error Message: "/me request is only valid with delegated authentication flow."
  - URL: https://graph.microsoft.com/v1.0/users/gowrishankari97@outlook.com/events
    - Response:
      - Error Code: OrganizationFromTenantGuidNotFound
      - Error Message: "The tenant for tenant guid '{TENANT_ID}' does not exist."

Please let me know the solution for this.