The parameter shows the correct value 'cGFzc3dvcmQ=' in the console output but in the remote Jenkins job it gets set to 'cGFzc3dvcmQ'.
Console output:
First time build. Skipping changelog. > git config core.sparsecheckout # timeout=10
> git checkout -f e432212deecb3cda7108083c492fa828b916d91a################################################################################################################
Parameterized Remote Trigger Configuration:

• job: PasswordTest
• remoteJenkinsName: ug-devops-jenkins
• parameters: [Password=cGFzc3dvcmQ=]
• blockBuildUntilComplete: true
• connectionRetryLimit: 5
  ################################################################################################################
  Triggering parameterized remote job 'http://ug-devops-jenkins.fyre.ibm.com:8080/job/PasswordTest'
  Using globally defined 'Token Authentication' as user 'rddesai@us.ibm.com'
  Triggering remote job now.
  CSRF protection is enabled on the remote server.
  Remote job queue number: 96100
  Remote build started!
  Remote build URL: http://ug-devops-jenkins.fyre.ibm.com:8080/job/PasswordTest/3/ Remote build number: 3
  Blocking local job until remote job completes.
  Remote build finished with status SUCCESS.