Problem using AES Encrypt

Good afternoon,

I am having a problem when using the plugin, both for encrypttext and decrypttext.

I am trying to access via SCS and I always get the error "Error encrypting value: This plug-in [com.unionbankph.plugins.aesencrypt] is not registered to access secured values ​​for the given external system key [Key]. Check the external systems plug -ins list in the Administration Console." even though the plugin is correctly in the credential's plugin list. I am currently using them in the following way

local!base64Key: decodebase64string("pruebaencript"),
local!eas: fn!encrypttext(
valueToEncrypt: local!valor,
scsKey: "pruebaencript",
scsField:"Key",
iv: local!base64Key
),

Thank you so much