Hello @Gale , Thanks for using Microsoft Q&A Platform.
As we know we can create only one free tier resource per Azure subscription. If you have already deleted a resource, then this could be an issue with soft delete.
Please purge the deleted resource to create a new one by following this documentation: https://learn.microsoft.com/en-us/azure/ai-services/manage-resources?tabs=azure-portal
I hope this helps.
Regards,
Vasavi