Error Detail While try to switch over the database and check with show configuation command getting the following error:

DGMGRL> show configuration
Configuration - dg_config
  Protection Mode: MaxPerformance
  Members:
  PRIMARY - Primary database
    Error: ORA-16763: redo transport service for a member is running
    standby - Physical standby database 
Fast-Start Failover:  Disabled
Configuration Status:
ERROR   (status updated 67 seconds ago)

Solution:

Performed the below steps to resolve the issue,

1. Checked the standby database to verify if the MRP process is running
2. If the MRP process is still running, cancel it using the command: “alter database recover managed standby database cancel;”
3. Initiated the MRP process with the following command instead of “alter database recover managed standby database disconnect from session;”

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION;

The MRP process was started with the command above, fixing the issue.