Thank you for posting your query on Microsoft Q&A, from above description, from above description it seems like you are looking to create/configure an App Service certificate, save it in KeyVault and set it to auto renew.
Please do correct me if this is not the case by responding in the comments section.
You must follow Create and manage an App Service certificate for your web app
- To configure a WildCard certificate, Buy and configure an App Service certificate.
- Store certificate in Azure Key Vault
- Renew an App Service certificate
- Export an App Service certificate
Thanks,
Akshay Kaushik
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