You are probably running a maven build with the following configuration:
rtMaven.deployer.deployArtifacts = false
This configuration disables artifacts deployment to Artifactory. If you want the artifacts to be deployed during the build, change this configuration to true
or simply delete it.
You can also deploy the artifacts in a later stage, if you collected build info, by calling:
rtMaven.deployer.deployArtifacts buildInfo
Check this pipeline for an example of late deploy, or this pipeline for an example of regular deploy. More details can be found in the documentation.
If this doesn't answer your question please share your pipeline with us.