Can't add SKU to automatic repricing rule

Hi everyone,

I have a question about the automatic repricing tool.

I created a rule, which lowers my price to 1 euro less than the best actual price.
Then, I set the min and max prices, for all my SKUs.
The marketplaces are all configured, also.

When I try to add a SKU, I click on “assign to rule X” and nothing happens.
No error message, nothing.

Can someone help me with this?
Thanks a lot for your time and have a great day.