Truenas OpenVPN Client to Pritunl OpenVPN Server

i am trying ways to connect my truenas openvpn client to pritunl openvpn server
at last it is able to connect to the pritunl
but at pritunl side, i am seeing this error and the truenas is offline

[restless-waves-1164] 2023-11-15 14:19:49 Authenticate/Decrypt packet error: packet HMAC authentication failed
[restless-waves-1164] 2023-11-15 14:19:49 TLS Error: incoming packet authentication failed from [AF_INET6]::ffff:

i am totally new in this field.
can someone help?