Troubleshooting Mixpanel Lookup Tables API Issues

Hi, I am new to Mixpanel and trying to automate the replacement Lookup tables: https://developer.mixpanel.com/reference/lookup-tables When trying to list the lookup tables via the GET api is get a 200 code but the results are Null. But I do have tree tables already manually imported via de UI. Also when I try the PUT if says that the 'getByKeyId' failed. I thought this way due to being on the Free plan, but I upgraded to Growth and it is still nog working. Is there someone that can help me?