I might be wrong, being located in Europe and not often using the US located datacenters. But are you sure about the provided datacenter location "ussouth"? I can't seem to find it under the official Azure locations.
No registered resource provider - EnableBackup error

I was trying to enable backup, following Azure recommendations step by step guide, and following error:
No registered resource provider found for location 'ussouth' and API version '2018-01-10' for type 'locations/checkNameAvailability'. The supported api-versions are '2018-01-10'. The supported locations are 'westus, eastus, northeurope, westeurope, brazilsouth, eastasia, southeastasia, northcentralus, southcentralus, japaneast, japanwest, australiaeast, australiasoutheast, centralus, eastus2, centralindia, southindia, westindia, westcentralus, canadacentral, canadaeast, westus2, uksouth, ukwest, koreacentral, koreasouth, francecentral, australiacentral, southafricanorth, uaenorth, switzerlandnorth, germanywestcentral, norwayeast, westus3, jioindiawest, swedencentral'.
I've read some entries with similar errors (different API versions) and would appreciate advice on how to solve this