I think I understand how to fix this. This is a two part issue. The first is improperly checking for teams as a normal user (I know how to fix this). The other issue is related to JENKINS-34835 where teams are inconsistently referred by name instead of slug (slug is what it should be using). To understand the name vs slug check out the GitHub API response example in https://developer.github.com/v3/orgs/teams/#list-teams. I'll create a patch which helps address some of the exceptions.

Code changed in jenkins
User: Sam Gleske
Path:
src/main/java/org/jenkinsci/plugins/GithubSecurityRealm.java
http://jenkins-ci.org/commit/github-oauth-plugin/ee8b0370640658e9790358ce49b14445f9cfb74c
Log:
JENKINS-34896 Skip searching users when

searching for teams.

Code changed in jenkins
User: Sam Gleske
Path:
src/main/java/org/jenkinsci/plugins/GithubSecurityRealm.java
http://jenkins-ci.org/commit/github-oauth-plugin/72ddf25e435d5467fb5b928ceb45e7f6017b79fd
Log:
JENKINS-34896 Skip searching users when

searching for teams.

Code changed in jenkins
User: Sam Gleske
Path:
src/main/java/org/jenkinsci/plugins/GithubSecurityRealm.java
http://jenkins-ci.org/commit/github-oauth-plugin/597ade3c6a49d77b9f36f2fa80e3ddf221e006d6
Log:
JENKINS-34896 Skip searching users when

searching for teams.

Code changed in jenkins
User: Sam Gleske
Path:
src/main/java/org/jenkinsci/plugins/GithubSecurityRealm.java
http://jenkins-ci.org/commit/github-oauth-plugin/4bd1519cc2273c0ec4b211c487500039695ba59f
Log:
Merge pull request #68 from jenkinsci/JENKINS-34896

JENKINS-34896 Skip searching users when searching for teams

Compare: https://github.com/jenkinsci/github-oauth-plugin/compare/ce15460dda50...4bd1519cc227

Code changed in jenkins
User: Sam Gleske
Path:
CHANGELOG.md
http://jenkins-ci.org/commit/github-oauth-plugin/c78dc42fd2f8f468f6ec1021e8ebc7473daf484b
Log:
update CHANGELOG

[fixes JENKINS-16350]
[fixes JENKINS-34896]
[fixes JENKINS-39200]

Code changed in jenkins
User: Sam Gleske
Path:
CHANGELOG.md
http://jenkins-ci.org/commit/github-oauth-plugin/83f478099714eecefdfbe15068b83ccc905a4534
Log:
update CHANGELOG

[fixes JENKINS-16350]
[fixes JENKINS-34896]
[fixes JENKINS-39200]

Code changed in jenkins
User: Sam Gleske
Path:
CHANGELOG.md
http://jenkins-ci.org/commit/github-oauth-plugin/c175b45f6eab1ee86b1af28df7e7838f51521b1f
Log:
update CHANGELOG

[fixes JENKINS-16350]
[fixes JENKINS-34896]
[fixes JENKINS-39200]

Code changed in jenkins
User: Sam Gleske
Path:
CHANGELOG.md
http://jenkins-ci.org/commit/github-oauth-plugin/85599d1b484328ce64bc4e21a79c9f43ed051a8c
Log:
update CHANGELOG

[fixes JENKINS-16350]
[fixes JENKINS-34896]
[fixes JENKINS-39200]

This should be fixed. Release github-oauth 0.25.