Hi Mohammad,
I would encourage you to use command "select asehostname()" to verify the host you are connected to and to verify the needed alias has been granted on both nodes.
The code executed by the DR Agent to verify the alias has been granted is:
sp_helpuser 'dbo'
And verify the TSD_maint user is shown in the Login_name alias list.
I would again encourage you to peform this validation on both nodes.
Regards,
Stephen