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U2419HC, MacBook Pro 13", No USB Type-C Signal from your device

Hello,

I have a brand new MacBook Pro 13" and new Dell U2419HC.

I get the message No USB Type-C Signal from your device when I connect the MacBook Pro to the U2419HC. I've tried the Dell USB-C to USB-C cable that came with the U2419HC. I've also tried the cable that came with the MacBook. 

The MacBook works fine with another USB-C display I have (LG ultra fine)

Any ideas?