Lots more information needed, I've had no issues with TACACS+ on Adtran switches.
Can you post model and firmware as well as config with passwords redacted? What is the nature of the failure?
What are the results of "debug tacacs+" when you attempt to authenticate?
Thank you for the reply.
I don't see any issues with the Authentication, but the issue could be authorization limiting with access levels.
(ADTRAN has only two access levels 1 & 7 (=15))
I had allowed given full access, same time want to limit access using command sets, which is not working.