Hello Dev Team
This error typically occurs when the cache name you're trying to use is already taken or was recently deleted.
After deletion, the name remains reserved for the same subscription, allowing its owner to recreate the cache.
If it isn’t recreated, the name becomes available to other subscriptions once the 30-day reservation period ends.
To resolve this issue, try selecting a different name or wait for the original name to become available again after the reservation expires.