Don't know for sure but needs to be it's very lowest temp.
We have an unvented boiler in a cupboard with all the hot pipes coming out of it.
I put it on top and the bread rises nicely in about 2 hours.
Knead it for the right amount of time and really get into it.
You tube how to knead dough properly if not sure.
Then prove it in a warm place like an airing cupboard with a damp tea towel on top to make it rise.
I do not agree about room temp, some ovens now have a bread proving facility.
Or you...