Recently while trying to register the plugin, we got the below error
Microsoft.Crm.CrmException: Plug-in assembly fullnames must be unique (ignoring the version build and revision number). —> Microsoft.Crm.CrmException: Plug-in assembly fullnames must be unique (ignoring the version build and revision number).
It was because we were trying to register the assembly which was already registered in that environment, instead of updating it.
Also, refer – https://helpfulbit.com/plugin-assemby-fullnames-must-be-unique/
Hope it helps.
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