i don't know it's still be a problem with you or not, but recently we faced the same problem, when we added the new switch that has lower mac address and create stack the existing switch as a stack together, the newer one become active role due to lower mac address our approach is rebooted the newer one, and the active role move to the existing/older one.. referred to this documentation https://documentation.meraki.com/MS/Stacking/Switch_Stacks#Configuring_a_Physical_Switch_Stack
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