Issue with privilege assignment on DELL-E3248P SONiC switches via RADIUS

Hello,  

I have configured RADIUS authentication on DELL-E3248P switches (Software Version: 4.2.2-Edge_Standard).

The authentication process works correctly, but I do not receive privilege level 15 upon login.  

The official documentation ([https://www.dell.com/support/kbdoc/en-us/000217350/dell-networking-sonic-aaa-authentication-using-radius-server) provides the following table for access levels:  

| **User Role** | **MPL Value** |  
| admin            | 15           |  
| operator        | No value or 1  |  
| netadmin       | 14           |  
| secadmin       | 13           |  

On the RADIUS server, I have configured the following attribute:  

shell:roles="admin"

Despite this configuration, I do not receive the highest privileges after logging in.  

Do you have any suggestions on how to resolve this issue?  

Thank you.