The Azure region us south central us does not show up when creating a cosmosdb account
As you can see in the screenshots, the region I need does not show up in the dropdown and I cannot select the us south central region (in Texas). The resource group is in Texas tho, and I have some VMs running there.
According to Azure Products by Region | Microsoft Azure cosmos db IS available in south central us.
IDK if this is a bug in the portal.
If the region does not appear it is because it is capacity constrained. You can raise a support ticket and ask if they can white list your subscription. In some cases this is possible.