"Exception caught: 401 Unauthorized" when sending MR updates

[gui-don]

Jenkins and plugins versions report

Environment

Jenkins: 2.332.2
OS: Linux - 5.16.18-200.fc35.x86_64
---
ace-editor:1.1
ansicolor:1.0.1
antisamy-markup-formatter:2.7
apache-httpcomponents-client-4-api:4.5.13-1.0
authentication-tokens:1.4
authorize-project:1.4.0
aws-credentials:191.vcb_f183ce58b_9
aws-java-sdk-ec2:1.12.201-326.veb_6ce41104a_e
aws-java-sdk-minimal:1.12.201-326.veb_6ce41104a_e
bitbucket:223.vd12f2bca5430
bootstrap4-api:4.6.0-5
bootstrap5-api:5.1.3-6
bouncycastle-api:2.26
branch-api:2.1046.v0ca_37783ecc5
build-timeout:1.20
caffeine-api:2.9.3-65.v6a_47d0f4d1fe
checks-api:1.7.3
cloudbees-bitbucket-branch-source:765.v5a_2d6a_23c01d
cloudbees-folder:6.714.v79e858ef76a_2
command-launcher:81.v9c2cb_cb_db_392
config-file-provider:3.10.0
credentials:1087.1089.v2f1b_9a_b_040e4
credentials-binding:523.vd859a_4b_122e6
custom-folder-icon:1.9
dark-theme:156.v6cf16af6f9ef
display-url-api:2.3.6
docker-commons:1.19
docker-workflow:1.28
durable-task:496.va67c6f9eefa7
ec2:1.68
echarts-api:5.3.2-1
font-awesome-api:6.0.0-1
git:4.11.1
git-client:3.11.0
git-server:1.11
gitlab-api:5.0.1-69.vcdc19e779072
gitlab-branch-source:625.v85cf3a_400cfe
gitlab-plugin:1.5.31
handlebars:3.0.8
handy-uri-templates-2-api:2.1.8-22.v77d5b_75e6953
jackson2-api:2.13.2.20220328-273.v11d70a_b_a_1a_52
javax-activation-api:1.2.0-3
javax-mail-api:1.6.2-6
jaxb:2.3.0.1
jdk-tool:1.5
jersey2-api:2.35-7
jquery3-api:3.6.0-3
jsch:0.1.55.2
junit:1.63
lockable-resources:2.14
mailer:414.vcc4c33714601
matrix-auth:3.1.2
matrix-project:771.v574584b_39e60
mercurial:2.16
momentjs:1.1.1
node-iterator-api:1.5.1
pipeline-build-step:2.18
pipeline-graph-analysis:195.v5812d95a_a_2f9
pipeline-input-step:448.v37cea_9a_10a_70
pipeline-milestone-step:101.vd572fef9d926
pipeline-model-api:2.2077.vc78ec45162f1
pipeline-model-definition:2.2077.vc78ec45162f1
pipeline-model-extensions:2.2077.vc78ec45162f1
pipeline-multibranch-defaults:2.1
pipeline-rest-api:2.24
pipeline-stage-step:293.v200037eefcd5
pipeline-stage-tags-metadata:2.2077.vc78ec45162f1
pipeline-stage-view:2.24
plain-credentials:1.8
plugin-util-api:2.16.0
popper-api:1.16.1-3
popper2-api:2.11.5-1
resource-disposer:0.19
role-strategy:3.2.0
saml:2.296.v0016349946db_
scm-api:608.vfa_f971c5a_a_e9
script-security:1158.v7c1b_73a_69a_08
simple-theme-plugin:103.va_161d09c38c7
snakeyaml-api:1.30.1
ssh-credentials:277.v95c2fec1c047
ssh-slaves:1.814.vc82988f54b_10
sshd:3.228.v4c9f9e652c86
structs:318.va_f3ccb_729b_71
theme-manager:0.6
timestamper:1.17
token-macro:293.v283932a_0a_b_49
trilead-api:1.57.v6e90e07157e1
variant:1.4
workflow-aggregator:2.7
workflow-api:1144.v61c3180fa_03f
workflow-basic-steps:948.v2c72a_091b_b_68
workflow-cps:2689.v434009a_31b_f1
workflow-cps-global-lib:570.v21311f4951f8
workflow-durable-task-step:1130.v8fd69d0b_8857
workflow-job:1180.v04c4e75dce43
workflow-multibranch:712.vc169a_1387405
workflow-scm-step:399.v9b_8f4da_65061
workflow-step-api:625.vd896b_f445a_f8
workflow-support:819.v37d707a_71d9b_
ws-cleanup:0.42

What Operating System are you using (both controller, and any agents involved in the problem)?

Linux; jenkins-master in docker

Reproduction steps

1. Setup the plugin configuration: working.
2. Setup credentials and hit the test button: working.
3. Setup multibranch pipeline: all working.
4. Build status on gitlab: not working.

Expected Results

Build status on gitlab.com

Actual Results

Not build status on gitlab.com

Anything else?

Logs says:

May 05, 2022 9:23:43 PM WARNING io.jenkins.plugins.gitlabbranchsource.helpers.GitLabPipelineStatusNotifier sendNotifications
Exception caught: 401 Unauthorized

I want to emphasize: credentials works. Test button says: Credentials verified for user XXX. The Personal Access Token gives access to everything gitlab.com can authorize.