First, ground service in the main terminal at Doha is abysmal.
I was booted off a flight to LHR and rescheduled for the next day’s Manchester flight while I sat in the lounge. (The only thing I can figure is that I had the lounge agent change my seat and that somehow turned me into a no-show.) I was not told and had to hotfoot it back to the transfer desk. Fortunately, there was no line and I was able to get back onto the flight to connect to my final leg home to Houston.
Having said that 45 minutes should never be a legal connection in Doha and anyone who connects through there should look for a better option. Even if they let you book it, it is a recipe for disaster.
FWIW
DLM