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error from auxiliary database: ORA-12528: TNS:listener: all appropriate instances are blocking new c

Hello Team,

I'm using dataguard standby approach(for ex: creating the standby database of same version on new server, perform a switchover and upgrade it to 19c) 
for migrating our 12.2 database to 19c. I'm in the process of building standby database of same version on the new server.
During this process, I get the below error while I try to connect the auxiliary database(nomount) to run  "rman duplicate" command in order to build the standby database.

[op_ora@dgd-test-a bin]$ rman auxiliary sys/XXXXXXXXX@testmigb
Recovery Manager: Release 12.2.0.1.0 - Production on Mon Jul 27 22:33:57 2020
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