Camunda nexus repo 401 error for mvn

While creating docker image using camunda/docker-camunda-bpm-platform: Docker images for the camunda BPM platform (github.com) – I am facing below error →

authentication failed for https://repository.nexus.camunda.cloud/content/groups/internal/org/camunda/bpm/tomcat/camunda-bpm-tomcat/7.18.0/camunda-bpm-tomcat-7.18.0.tar.gz, 
status: 401 Unauthorized
[ERROR]   org.camunda.bpm.tomcat:camunda-bpm-tomcat:tar.gz:7.18.0
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-dependency-plugin:2.8:get (default-cli) on project standalone-pom: Couldn't download artifact: Could not transfer artifact org.camunda.bpm.tomcat:camunda-bpm-tomcat:tar.gz:7.18.0 from/to camunda-nexus (https://repository.nexus.camunda.cloud/content/groups/internal/): authentication failed for https://repository.nexus.camunda.cloud/content/groups/internal/org/camunda/bpm/tomcat/camunda-bpm-tomcat/7.18.0/camunda-bpm-tomcat-7.18.0.tar.gz, status: 401 Unauthorized
[ERROR]   org.camunda.bpm.tomcat:camunda-bpm-tomcat:tar.gz:7.18.0
[ERROR] 
[ERROR] from the specified remote repositories:
[ERROR]   central (https://repo.maven.apache.org/maven2, releases=true, snapshots=false),
[ERROR]   camunda-nexus (https://repository.nexus.camunda.cloud/content/groups/internal/, releases=true, snapshots=true)
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
The command '/bin/sh -c /tmp/download.sh' returned a non-zero code: 1