Huawei ssh via hwtacacs authentication issue

Issue Description :

We have deployed Huawei 5700s switches in our network  
Issue is with one switch, we are not able to login device via ssh for tacacs authentication in one switch 
Serial number : V200R007C00SPC500
 Model : S5700 
Version : 5.160 
Request you to please help on deploying the switch

Alarm Information:

Handling Process:

1. Check configuration .
2. debugging aaa all .
3. debugging hwtacacs all .

Root Cause:

Customer miss configuraiton on default_admin and set wrong domain as administrator .

 Solution:

1. Configure authentication-scheme SBI-HUAWEI under default_admin
2. Change default_admin as Administrator user default domain .

Suggestions:

Usually we suggest default_admin as Administrator domain .