Seems like there is an issue with Attribute Mapping. Please follow the steps below to correct the Attribute Mapping:
1) Go to Service Provider tab and click on Test Configuration button. It will return with some attributes from Azure AD. In that table, you will see the name of the attribute on the left column and attribute values on the right side column.
2) You need to map the left-hand column attribute name with the WordPress attributes.
3) Go to Attribute Mapping tab and map the attributes.