Infinte Loop login

Good morning, we have tried to connect the plugin with the Customer’s account more than 30 times (30 times) and when everything seems to have gone well from the paypal page that confirms that everything is ok, a button suggests us to return to woocommerce.
When on woocommerce your plugin asks to login again.
And so an infinite loop is triggered. We have already involved the Paypal specialist group who, once everything was verified, told us to ask you for support. If in the space of 10 days you have already released 3 versions there is obviously something wrong.
I don’t know what to say…