Google Classroom add-ons are now generally available to developers! Please see the
add-ons documentation for more information.
Known issues
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This page documents known developer concerns with the
Classroom add-ons API.
Error messages
Most errors are covered in the descriptions of specific methods in the
reference documentation. Some errors are specific to add-ons.
If you're unable to troubleshoot an error on your own, reach out to your Google
contacts for support.
CourseWork API compatibility
See the Create attachments from a third-party site guide to creating add-on
attachments through a CourseWork flow.
Pop-up blockers
The add-on sign-in flow can be disrupted if the end user has enabled a pop-up
blocker. See the manage pop-up blockers section of the frictionless sign-in
page for more information about how to implement the sign-in flow in the event
that end users enable pop-up blockers.
Multi-login
Multi-login is not supported for add-ons. See the multi-login section of the
frictionless sign-in page for more information about multi-login issues and
possible workarounds.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-28 UTC.
[null,null,["Last updated 2025-08-28 UTC."],[],[],null,["# Known issues\n\nThis page documents known developer concerns with the\nClassroom add-ons API.\n\nError messages\n--------------\n\nMost errors are covered in the descriptions of specific methods in the\n[reference documentation](/workspace/classroom/reference/rest). Some errors are [specific to add-ons](/workspace/classroom/reference/addons_errors).\n\nIf you're unable to troubleshoot an error on your own, reach out to your Google\ncontacts for support.\n\nCourseWork API compatibility\n----------------------------\n\nSee the [Create attachments from a third-party site](/workspace/classroom/add-ons/get-started/attachments-journey#create-attachments) guide to creating add-on\nattachments through a CourseWork flow.\n\nPop-up blockers\n---------------\n\nThe add-on sign-in flow can be disrupted if the end user has enabled a pop-up\nblocker. See the [manage pop-up blockers section of the frictionless sign-in\npage](/workspace/classroom/add-ons/developer-guides/frictionless-signin#manage_pop-up_blockers) for more information about how to implement the sign-in flow in the event\nthat end users enable pop-up blockers.\n\nMulti-login\n-----------\n\nMulti-login is not supported for add-ons. See the [multi-login section of the\nfrictionless sign-in page](/workspace/classroom/add-ons/developer-guides/frictionless-signin#multi-login) for more information about multi-login issues and\npossible workarounds."]]
