+1

Master billed/group bookings don't normally get credit although occasionally the hotel makes a mistake.
I believe there are a couple of posts where master billed/group bookings don't get lounge access -- which may be consistent with the T&C which seems to say that -- but I've never had that issue.

And, I was on a master billed stay at a US legacy Marriott property a few days ago. I gave them my MR info at check-in. The FD stepped away for a couple of minutes and came back from the MOD. They told me they had upgraded me to one of their best suites and asked me to give them advance notice in the future if I was staying on a master billed stay so they could pre-upgrade me. But ... they had my name on the reservation as part of the group -- not sure that's the case on a tour as you describe.