DorMarcovitch-5524, Thanks for the question!
Since you have posted the question on azure-webapp
tag, just to clarify, are you leveraging Azure App Service WebApp, and attempting to upload private certificate, as outlined in the following docs?
Secure connections by adding and managing TLS/SSL certificates in Azure App Service
To assist you better, please do provide more details about your Azure resource, internal app, and your scenario.
Just to highlight, on App Service WebApp, you need to bind the certificate, as outlined in this doc: Renew uploaded certificate
Kindly let us know, I'll follow-up with you further.
--To receive insights from the targetted audience/SMEs, we may have to re-tag appropriately.