Jira aui-select in jira Service Desk Customer Portal

Hi Everyone,
I developed a Jira Plugin that implements a Custom Filed that uses the Jira aui-select element, (asynchronous) version 8.5.0 for the front end rendering. It runs on Jira 8.8.1.
The select aui element works beautifully when I use it in the Jira Software deshboard. On the contrary, when used in the customer portal, it is a plain input field where the user can write anything.
In my atlassian-plugin.xml I have

  <web-resource key="form-plugin-resources" name="form-plugin Web Resources">
  <context>atl.general</context> 
  <context>servicedesk.portal</context>
  <context>servicedesk.general</context>
  <context>customerportal</context>
    <dependency>com.atlassian.auiplugin:aui-select</dependency>
    <dependency>com.atlassian.auiplugin:ajs</dependency>
  </web-resource>

What I am doing wrong?

Thanks

G.