If a user is set to back up a SharePoint but doesn’t have a SharePoint plan, you’ll start seeing warnings pop up in your Veeam for Microsoft 365 backups. There are two options for resolving the “User ‘USERNAME’ does not have a valid Microsoft 365 license with SharePoint plan enabled” warning.
Option 1: Contact Microsoft to add a SharePoint plan to the current users’ license.
Option 2: If the SharePoint site does not need to be backed up, or is not licensed to, then you can exclude the SharePoint for the user. Below are the steps to exclude a SharePoint for a specific user:
If you are backing up your entire organization:
- Navigate to the Select objects to exclude tab.
- Click the Add button to open the users list, select the user that is experiencing the warning, and select click Add.
- Select the user and Click the Edit button. Check Site to exclude, hit OK, and save the job settings.
If you have specific objects selected to backup:
- Navigate to the Select objects to back up tab.
- Select the user from the list and click the Edit button. Uncheck Site to exclude, hit OK, and save the job settings.
Source: https://www.managecast.com/veeam-for-microsoft-365-user-username-does-not-have-a-valid-microsoft-365-license-with-sharepoint-plan-enabled-warning/