Hi @aurabeastrs, welcome to our forums.
This kind of error is sometimes related to a VPN blocked. Just to discard that scenario in case you are using a VPN.
If you are not using a VPN and is always showing you the same message when trying to login it can be related with an account suspension.
In that case, you can appeal your ban here: Appeal a ban - Support | Amazon Games
The appeal review team is working hard on all the appeals so it can take a few hours but you will get an answer from them as soon as possible.
Hope you have a good one,