Adobe firefly won't let me upload screengrabs of my own work

Previously I would take a screengrab of my work in Illustrator, upload it to firefly and then prompt it to make 3D, add some fabric texture and it would generate a more realistic version of my photograph.

Now it won’t let me upload a screengrab it says it has ‘Content Credentials’ so it can’t use it. Why is this happening? 

I shared the same image with a colleague and it worked, I don’t understand.