The leapp module fails basic authentication with a proxy server for update OS (8.10 TO 9.6)

Hi,

The leapp module fails to authenticate with a proxy server. I configured everything, but there was nothing I could do. Here are the configurations I tried:
1) configuring /etc/leapp/leapp.conf
inserting the directive:
[dnf]
http://user:pass@proxy:80.
2) configuring /etc/dnf/dnf.conf with the proxy variables:
proxy=http://proxy.xxx.xxx:8080
proxy_username=user
proxy_password=password
proxy_auth_method=basic
3) exporting the http_proxy and https_proxy environment variables, but I don't think leapp reads the environment variables.
When I removed the corporate proxy authentication, the leapp immediately contacted the Redhat repositories and downloaded the update. This happens when attempting to upgrade systems with basic_authentication (Base64 Encoded). Can anyone help? Is there a workaround? This issue has currently been detected when upgrading from 8.10 to 9.6.
Thanks.