Hey guys my mate had this same issue on his 2018 ec300 sixdays and thought it was the starter but ended up getting a new switch cluster (starter switch) and that fixed it (after trying everything else for around 4 months) I have just done my cluster as well and elec start isnt working. Will be swapping out the ec cluster for an xc ignition to prevent this in the future. Hope that helps !
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2019 ec300 
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