Unable to see the Resources while forecasting

Summary:

We are uploading the Resources(team members) on a project using "ProjectResourceAssignmentImportTemplate.xlsm" FBDI template.

The Manage Project Resources page displays team members in a confirmed status.

While creating the Forecasting. Only the first resource from the FBDI template is showing as an available resource on a project. The remaining resources are not available.

After looking at the PRBS on the Project. I see only resource from the FBDI added to the Named Person.

The remaining resources are not getting added to the PRBS at the Project level.

When we perform the same steps manually, i.e., adding resources from the "Manage Project Resources" page, we see the resources being automatically added to the PRBS and made available during forecasting.