Unable to Select a Different Vendor When Authorizing an Account on ADE Using iPad

Hi everyone, I'm encountering a problem when trying to authorize an account in ADE (Adobe Digital Editions) using my iOS device. It seems that I'm unable to select any other vendor aside from the default one during the authorization process.

Has anyone else faced this issue? Are there known solutions or any updates expected that might address this on iOS device?

Would appreciate any insights—thanks in advance!