come one what are these formatting issues here when posting links??

another odoo14 question:
applies to quotations, sales orders and invoices.
When I email the document and it goes out to the customer, only the main contact email receiver has the opportunity to open the link and sign/pay for it

original link: (I removed the original URL, but you can see the differences in the links)
(1) gets: https://ODOO.URL/mail/view?model=sale.order&res_id=650...

the secondary contact gets a different link which leads him to a login page.
(2) gets: https://ODOO.URL/mail/view?model=sale.order&res_id=650

It's missing this part: &access_token=a89d2e69-66fe-4327-a09b-288904f27923

How can I ensure that every contact added as recipient gets an URL where they can access the order or invoice and pay?

Original recipient (customer) gets an url in the email as here:
https://ODOO.URL/mail/view?model=sale.order&res_id=650&access_token=a89d2e69-66fe-4327-a09b-288904f27923

additional recipients (manually added) get this here
https://ODOO.URL/mail/view?model=sale.order&res_id=650

It's missing this part:
&access_token=a89d2e69-66fe-4327-a09b-288904f27923

got a hint in the facebook group of adding portal access to these contacts. They get an invitation email and can access the documents. But when they click on the button in the email with an order or invoice, it doesn't directly open the invoice, they have to login first. While the original company contact gets a link with that token that directly opens the invoice (similar to the customer preview link)

why does the company contact gets it in a different way than the related contacts of the company? Any way to fix this?