I created a Kanban board and added a bunch of issues. I then created a new Scrum board and selected "Board from existing project" and selected the project. Then, when viewing the new Scrum board I only see one issue from the project in the board.
here is link to similar question with answer:
Cause in that case
The Filter Query does not include the project that you were trying to create issue at. In example from link on Atlassian site, it only includes Test and Test 2 is not present.
Create a new Rapid Board that includes the respective Projects to ensure that the notification message does not appear on the Rapid Board.
I hope it will help.
Generally the issue in this situation is that you don't have the status of the issue mapped to a column on your Agile Board. Go to Configure and the Columns section and there will be a message warning you that not all statuses are mapped to columns. You can map them on that page so that the issues will appear on the board.
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