Picking up a self hosted manual. It had been a very long time and had to update my secret in Azure - resolved that.
Now I’m getting the error below. I had a step in my original configuration steps where I had copied over /core/aspnet-dataprotection/ which contained keys, but not sure where that came from?? Thinking the missing key should be in here.
System.Security.Cryptography.CryptographicException: The key {1bc171ab-8248-4504-8e36-800016fdce9b} was not found in the key ring. For more information go to How to: Use Data Protection - .NET | Microsoft Learn