New Macbook - external display works with lid open but not closed
When I have my laptop connected to an external display (Acer B286HK) the display works fine with the laptop lid open, but with the lid closed it will work for ~30 seconds and then blacks out. I cannot wake the computer with keyboard or mouse inputs. This issue is happening with two different laptops, both new: a 2017 Macbook Pro 13" and brand new 2018 Macbook Air. I have tried resetting the SMC to no avail.
MacBook Air (2018 or later)