ISTFlyer if you look at
stopover-terms-conditions you will see:-
" 4. The Stopover offer is only valid for Qatar Airways confirmed ticket holders with a minimum transit time of 12 hours in Doha.
5. The Stopover offer is only valid for Qatar Airways E-ticket numbers starting with "157" and this is required to be entered at the payment page.
8. The Stopover offer is NOT applicable for codeshare flights (outbound and/or inbound). Rack rate will be charged by the hotel directly from customers checking in based on Doha being the first or final destination.
9. The Stopover offer is NOT valid for passengers where Doha is their first departure point or final destination. Rack rate will be charged by the hotel directly from customers checking in based on Doha being the first or final destination. "
Thus a Multicity reservation is no longer required nor has that rule ever been fully implemented. I think that the Multicity in this offer actually means a PNR that is at least for origin-DOH- destination. I.e. Transitting DOH.
Richekf it is impossible to see from your post if you qualify or not. Look at the extract of TandC's above to see if you qualify. You may like to look at
qatar-doha-hotel-stopovers-no-longer-free. for ideas and suggestions.