Why is concurrency full when I still have Browser hours left?

Browser hours and concurrency slots are separate limits. You may have browser time left but be unable to create another browser because your active sessions have reached the concurrency limit.

1. Make sure you are checking the same project, then compare its concurrency limit with its active sessions.
2. Look for sessions whose tasks have finished but which were never closed. End the sessions you no longer need.
3. Try creating a session again once a slot is released. If tasks can run in batches, reduce your program’s parallelism. Choose a higher-concurrency plan if you really need more sessions running at once.

For example, if your project allows 25 concurrent sessions and all 25 are active, you need to release a slot even when Browser hours remain. If active sessions are below the limit but you still receive the same message, keep the error details for further investigation.