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Invalid Package - SPFX Solution (solved)
Started receiving Valid App Package = No today while trying to update an app package in the catalog. Looking at the unavailable apps view reveals the following error message: Invalid SharePo...
That was a bug that got out - we believe it should be working now. Can you let us know if you are still running into the issue?
Could it be that you are using an older version of the SPFx as a base for this app?