I have a Macbook Pro 16inch M1 from 2021 and it is not connecting to my Studio Display (screen flashes)

Hello,

I have a Macbook Pro (Apple M1 Max, 64 GB)

I bought the Studio display very recently.

When I connect the thunderbolt cable the following happens:

my MacBook screen goes black and the studio display gets an image then my studio display goes black and my MacBook gets the image.

This happens all very quickly, in milliseconds, so my screens are both flashing.

I do however see a message appearing: Unable to connect accessory I think, the screen flashes too quickly to really see it.

However, when I connect the MagSafe power adapter to my MacBook it works.

Problem solved.

However, I also have an older Macbook pro from 2018, which doesn't have MagSafe, so with that Macbook the studio display doesn't work.

Can anyone help?

Thanks in advance.

Kind regards