Are you pre-heating your dutch oven?
Yep - to 250°C, and no faffing around once it's out.
How long to you cook it for in the dutch oven before removing the lid?
25 minutes
It might not be cooking enough if it's in a cold dutch oven for too brief a time.
If it's not hot enough, then I need a new oven, unfortunately
Try a much shorter prove. The dough might not have much energy left when you put it in the oven.
@Saffronspokes started
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Yep - to 250°C, and no faffing around once it's out.
25 minutes
If it's not hot enough, then I need a new oven, unfortunately