To assign a license to a group, the group must be a security group, not an Office 365 group or a mail-enabled security group1. According to the image, Group1 and Group3 are security groups, while Group2 and Group4 are Office 365 groups. Therefore, only Group1 and Group3 can be assigned a license.
To assign a license to a group, you need to follow these steps2:
Sign in to the Azure portal with a license administrator account.
Go to Azure Active Directory > Licenses and select the product license that you want to assign to groups.
Select Assign at the top of the page and then select Users and groups.
Search for and select the group that you want to assign the license to and then select OK.
Select Assignment options to enable or disable specific services within the product license and then select OK.
Select Assign at the bottom of the page to complete the assignment.