Hi @Nick Thank you for posting your query on Microsoft Q&A.
Apologies for the trouble you are facing.
This could be related to high demand in certain regions. I tried creating a cosmos in UK south and west but facing the same issue.
"Sorry, we are currently experiencing high demand in UK South region and cannot fulfill your request at this time.
To request region access for your subscription, please follow this link https://aka.ms/cosmosdbquota
Please let me know if you have additional queries.