Hi, welcome. Many sites implement Javascript for functionality. WWW::Mechanize does not support Javascript. From the doc:

Please note that Mech does NOT support JavaScript, you need additional software for that. Please check "JavaScript" in WWW::Mechanize::FAQ for more.

See also https://metacpan.org/pod/distribution/WWW-Mechanize/lib/WWW/Mechanize/FAQ.pod#JavaScript including the list of links to modules that do support JS.

Hope this helps!

The way forward always starts with a minimal test.

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