tfactl access denied
Our environment is using oracle grid database 12.2 . And found the tfa was installed together with the grid. 
 However I found "oracle" user is not able to execute tfactl with the following error: 
 [oracle@testing1:/home/oracle#] tfactl 
 User 'oracle' does not have permissions to run tfactl. Please check with TFA Admin(root). 
[root@testing1:/u01/app/12.2.0/grid/bin#] tfactl status
 .-----------------------------------------------------------------------------------------------------. 
 | Host | Status of TFA | PID | Port | Version | Build ID | Inventory Status | 
 +-------------+---------------+---------+------+------------+----------------------+------------------+ 
 | testing1 | RUNNING | 7733248 | 5000 | 12.2.1.0.0 | 12210020161122170355 | COMPLETE | 
 | testing2 | RUNNING | 6946956 | 5000 | 12.2.1.0.0 | 12210020161122170355 | COMPLETE | 
 '-------------+---------------+---------+------+------------+----------------------+------------------' 
[root@testing1:/u01/app/12.2.0/grid/bin#] tfactl access lsusers
