Your reason might be explained here:
As demand continues to grow, if we are faced with any capacity
constraints in any region during this time, we have established clear
criteria for the priority of new cloud capacity. Top priority will be
going to first responders, health and emergency management services,
critical government infrastructure organizational use, and ensuring
remote workers stay up and running with the core functionality of
Teams.
If you qualify for this category, you should reach out to Azure Support or your Microsoft representative. If not, you need to keep retrying (might work better at night) or try a different region.