Hi,
According to documentation old TLS protocols will be blocked starting in June 2023. Based on your description the change has been rolled out to the cluster for your vault today. You need to make sure applications that need to access your key vault support TLS 1.2.
Please see articles below:
What's new for Azure Key Vault - June 2023
https://learn.microsoft.com/en-us/azure/key-vault/general/whats-new#june-2023
Azure Key Vault security - TLS and HTTPS
https://learn.microsoft.com/en-us/azure/key-vault/general/security-features#tls-and-https
Please click Accept Answer if the above was useful.
Thanks.
-TP