This incident is now resolved. Thank you for your patience and understanding.
Event: We are aware that apps created after 2026-01-21 00:00:00 UTC are generated with an ID that contain an underscore which results in developers experiencing CORS issues and unable to test locally.
Workaround: Please use Firefox as your browser for now, which should allow you to continue testing.
We're actively working on a fix and will share more details about the specific issue shortly.
Thanks for your patience, and apologies for the disruption to your workflow.
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