Goto microsoft azure dashboard and click on drawer.

Now click 'Azure Active Directory'.

After that you will see this list, and click on 'App Registration'.

Now click on 'New Registration'.

Enter the application name as per your choice. and click 'Register'.

After that it will display your client id copy that and past in odoo credential.

Now click 'Add certificate or secret'in same page.

After that click on 'New client secret'.

After that it will display box where you have to add descriptions and expiry then click on 'Add'.

Now copy this 'secret key' and paste it in odoo credential.

Now click on 'Authentication' in same page.

Now clcik on 'Add Plateform'.

Select 'Web'.

Here configure your redirect url, here 'https://localhost:8044' = 'your domain'. Make sure domain is correct. else it throws an error when you generating a token.

Now copy this redirect url and past it in odoo credential.

Now click on 'Api Permission'.

Now click on 'Microsoft Graph'.

Now click on 'Deligated Permission' and scroll down it will shows permissions list.

Click on Calendar for calendar applications permissions. and select full access to user calendar. (That user can read, write, update and delete in calendar)

Click on Contacts for contacts applications permissions. and select full access to user contacts. (That user can read, write, update and delete in contacts)

Click on Maill for mail applications permissions. and select full access to user mail. (That user can read, write, update and delete in mails)

Click on Tasks for task applications permissions. and select full access to user task. (That user can read, write, update and delete in task).

From your organisation admin account you will need to grant permission.