Can't display values from relationship

Hi
I'm tried like a madness to figure out how to display relationship fields.
I have tried any compination from the documentation, and i'm just so lost.

I have created a term for products: venues

I have created a relationship with code:
Its to be able to add the terms in the users metadata.

function your_prefix_function_name() {
    MB_Relationships_API::register( [
        'id'   => 'venue-to-user',
        'from' => [
            'object_type' => 'term',
            'taxonomy'    => 'venues',
            'meta_box'    => [
                'title' => 'From title',
            ],
            'field'       => [
                'name'      => 'from label',
                'max_clone' => '1',
            ],
        ],
        'to'   => [
            'object_type' => 'user',
            'post_type'   => 'post',
            'taxonomy'    => 'category',
            'meta_box'    => [
                'title' => 'To title',
            ],
            'field'       => [
                'name'      => 'To label',
                'max_clone' => '1',
            ],
        ],
    ] );
}

I try to output it like the documentation says:

$terms  = get_terms( [
    'taxonomy'     => 'venues',
    'hide_empty'   => false,
    'relationship' => [
        'id' => 'venue-to-user',
        'to' => 1, // <--user ID
    ],
] );
foreach ( $terms as $term ) {
    print_r($term);
}

But i'm getting this output:
Array ( [invalid_taxonomy] => Array ( [0] => Invalid taxonomy. ) ) Array ( )

I want to have a cpt or taxonomy that can be related to a user and then output the data on the checkout page.
Adding it to the checkout page is not the problem, but output the relationship field is.