Updating to the latest plugin version I get the following error message from the plugin when trying to gather the sources:

 
stderr: fatal: Cannot prompt because user interactivity has been disabled.
remote: Invalid credentials
fatal: Authentication failed for '
<REDACTED>

at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:2842)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:2185)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:635)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$2.execute(CliGitAPIImpl.java:871)
at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1222)
at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1305)
at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:129)
at org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition.create(CpsScmFlowDefinition.java:165)
at org.jenkinsci.plugins.workflow.multibranch.SCMBinder.create(SCMBinder.java:143)
at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:311)
at hudson.model.ResourceController.execute(ResourceController.java:101)
at hudson.model.Executor.run(Executor.java:442)

'
When I go back to the 866.vdea_7dcd3008e version of four weeks ago then everything is OK.
If I go back to the in-between version then I also get the HTTP error which has been fixed in the latest one.

Can you take a look.