How to force HTTPS instead of HTTP on a profile website field

@themedutch

You can try this code snippet for replacing http: with https: in an UM field.
Change my_http to your meta_key name

add_filter( 'um_before_update_profile', 'um_before_update_profile_https_url', 999, 2 );
function um_before_update_profile_https_url( $changes, $user_id ) {

    $key = 'my_http';
    if ( isset( $changes[$key] ) && ! empty( $changes[$key] )) {
        if ( substr( $changes[$key], 0, 5) == 'http:' ) {
            $changes[$key] = str_replace( 'http:', 'https:', $changes[$key] );
        }
    }
    return $changes;
}

Install the code snippet into your active theme’s functions.php file
or use the “Code Snippets” plugin.

https://ww.wp.xz.cn/plugins/code-snippets/