Hi,
What specific azure service are you using (with the certificate)? A VM or Regular Azure Web Apps?
I actually find one of the tutorials on TLS for Azure web apps.(https://www.hanselman.com/blog/SecuringAnAzureAppServiceWebsiteUnderSSLInMinutesWithLetsEncrypt.aspx)
P.S. If you are using VM, please also tell us what’s the VM system (RH? Centos? Windows? etc…)
Thank you