SSSD: Failures are logged in sssd_$domain.log file that a group with the same name as user already exists when adding AD user account to the sysdb

Issue

• SSSD: Failures are logged in sssd_$domain.log file that a group with the same name as user already exists when adding AD user account to the sysdb:

(2022-06-08  8:52:40): [be[ipa.example.com]] [sysdb_add_user] (0x0040): [RID#3] Group named aduser@example.com already exists in an MPG domain  <-----
(2022-06-08  8:52:40): [be[ipa.example.com]] [sysdb_add_user] (0x0400): [RID#3] Error: 17 (File exists)  <-----

• Erroneous message is logged in /var/log/sssd/sssd_$domain.log file though 'id' lookup & authentication for trusted AD user are working fine.