hi, we have two macs, one in each office that one user has access to depending which office they are in

Office 1 mac you can see anyone's shared calendar, on mac 2 when I open a shared calendar (file, open shared folder) enter the persons calendar name, it finds it in the directory, I click ok

then nothing happens after that, there is no entry under shared calendars, nothing, no errors, nothing at all

it is the same office 365 account on each mac, same users, same machine, sames permissions etc

what could be wrong with Mac 2 causing this?