Add Public Key Certificate - Error uploading key certificate. The parameter location, thumbprint has an invalid value

I have App Service (SKU and size is PremiumV2 P3v2) and wanted to add certificate via Azure Portal. Went into Certificates then Public key certificates (.cer) and then Add certificate:

I choose .cer file and name and have an error:

Add Public Key Certificate - Error uploading key certificate. The parameter location, thumbprint has an invalid value.

This error occurs when you try upload a certificate which was already uploaded with a different name.

To resolve this error:

• Check if the certificate is already existing with another name, delete the existing certificates and try to upload again.

• Or Re-export the certificate and upload it to App Service.

Tested the same in my environment as below:

I have uploaded a .cer certificate in App Service.

When I tried to upload the same certificate with a different name, I got the same error.

Deleted the existing certificate and uploaded it again. Able to add the certificate to App Service.