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Are you using "vary symbology by attribute"? Then uncheck "Show Legend" from Symbology pane.
Check the steps to access the functionality in How To: Symbolize a feature layer using two types of symbology in ArcGIS Pro (esri.com)
That worked!!!! Thank you so much. I have been trying to figure it out for almost 4 hours.
Glad it worked out for you. Please mark "Accept as Solution" for the response that resolved your issue.
This helps other users facing similar problem in future.