Transfer Error

I’ve been trying to figure out when I try to sell any players on the transfer market it only allows me to sell them for $99 credits. After doing some digging on the internet it seems like I’ve been “transfer banned” I’m not really sure what I did to get banned but I might need to read the terms and conditions. Can I get some feedback on what are my options or what I can do so this doesn’t happen again. This is my first time player FIFA since high school and first time getting banned so I’m a little confused on what happened.