Browser opened in B1Up Interactive Authentication

Hi,
We are executing SBO in a VMware environment and we do have a problem with B1Up interactive credentials: these are not synchronized among the RDP clients. We tried to configure the default browser to Edge and check if there these credentials are stored, but not.

Please, do you know what browser is this window opening?

In the documentation is not informed https://help.boyum-it.com/B1PrintAndDelivery/index.html?b1printpersonalexchange.html