#BUSY errors are returned when a formula is waiting for a required resource that’s taking a long time to access. Possible reasons include:
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The formula is waiting for values from an external workbook link.
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The formula is waiting for resources needed to render the image.
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A function in the formula is still executing. It may be waiting for an external resource or it contains a complex calculation.
Python in Excel
If you're using Python in Excel, a #BUSY error may display while calculating a Python formula. Purchase a Python in Excel add-on license or enable the Python in Excel preview for access to premium compute and faster calculations. To learn more, see Python in Excel availability.
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