I can use Jenkins X with gitea and the gitea-plugin to create repos & setup MultiBranchProjects for PRs/master and webhooks and all that are working great. 
 
However each pipeilne build fails to update the build status. Here's the exceptions that are generated at the beginning and end of a pipeline run. Its a little odd its a 401 as there's 1 credential used for querying the MBP branches, reading repos from gitea and doing commits/issues/PRs etc - so the credential is fine and the same credential is used in the Jenkins server config + the MBp
 
Here's a sample stack trace at the start...
[Gitea] Notifying branch build status: PENDING Build started... ERROR: Could not send notifications org.jenkinsci.plugin.gitea.client.api.GiteaHttpStatusException: HTTP 401/Unauthorized {"context":"test-user/environment-jstrachan-test8-staging/master","description":"Build started...","state":"pending","status":"pending","target_url":"http://jenkins.jx.35.197.207.229.nip.io/job/test-user/job/environment-jstrachan-test8-staging/job/master/2/display/redirect"} at org.jenkinsci.plugin.gitea.client.impl.DefaultGiteaConnection.post(DefaultGiteaConnection.java:911) at org.jenkinsci.plugin.gitea.client.impl.DefaultGiteaConnection.createCommitStatus(DefaultGiteaConnection.java:550) at org.jenkinsci.plugin.gitea.GiteaNotifier.sendNotifications(GiteaNotifier.java:144) at org.jenkinsci.plugin.gitea.GiteaNotifier.access$200(GiteaNotifier.java:66) at org.jenkinsci.plugin.gitea.GiteaNotifier$JobCheckOutListener.onCheckout(GiteaNotifier.java:277) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep.checkout(SCMStep.java:127) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:85) at org.jenkinsci.plugins.workflow.steps.scm.SCMStep$StepExecutionImpl.run(SCMStep.java:75) at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:47) at hudson.security.ACL.impersonate(ACL.java:290) at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:44) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)  
 
then at the end:
[Gitea] Notifying branch build status: SUCCESS This commit looks good ERROR: Could not send notifications org.jenkinsci.plugin.gitea.client.api.GiteaHttpStatusException: HTTP 401/Unauthorized {"context":"test-user/environment-jstrachan-test8-staging/master","description":"This commit looks good","state":"success","status":"success","target_url":"http://jenkins.jx.35.197.207.229.nip.io/job/test-user/job/environment-jstrachan-test8-staging/job/master/2/display/redirect"} at org.jenkinsci.plugin.gitea.client.impl.DefaultGiteaConnection.post(DefaultGiteaConnection.java:911) at org.jenkinsci.plugin.gitea.client.impl.DefaultGiteaConnection.createCommitStatus(DefaultGiteaConnection.java:550) at org.jenkinsci.plugin.gitea.GiteaNotifier.sendNotifications(GiteaNotifier.java:144) at org.jenkinsci.plugin.gitea.GiteaNotifier.access$200(GiteaNotifier.java:66) at org.jenkinsci.plugin.gitea.GiteaNotifier$JobCompletedListener.onCompleted(GiteaNotifier.java:297) at hudson.model.listeners.RunListener.fireCompleted(RunListener.java:211) at org.jenkinsci.plugins.workflow.job.WorkflowRun.finish(WorkflowRun.java:688) at org.jenkinsci.plugins.workflow.job.WorkflowRun.access$1400(WorkflowRun.java:143) at org.jenkinsci.plugins.workflow.job.WorkflowRun$GraphL.onNewHead(WorkflowRun.java:1006) at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.notifyListeners(CpsFlowExecution.java:1368) at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$3.run(CpsThreadGroup.java:412) at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$1.run(CpsVmExecutorService.java:35) at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:131) at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Finished: SUCCESS