Every so often our website that is on Umbraco Cloud suddenly shows the azurewebsites.net URL on our dynamic URLs. Then after a memory cache reset the URLs revert back to the correct URL. We do transfer content from Staging to Live. What is causing this and is there a fix in 8?

Have you got the UmbracoApplicationUrl set in the umbracosettings.config ?

Hi - no these seem to be empty

Apologies - I missed the Cloud bit of your title. Sorry - no experience here. If you're on cloud I suggest you raise a support ticket though.

The docs linked are for v12 though, I don’t think it gets set for v8 since it has to be in the config file and can’t be read from env. variables. Also the correct place for Cloud questions would be in #1127946593786675331

I have also experienced this in the past, but before Umbraco Cloud was upgraded to its latest platform/infrastructure. I don’t think I ever got answer to why it happened. Regarding UmbacoApllicationUrl, for U12 it’s correct that Umbraco Cloud overrides values in the comfig. See here: https://github.com/umbraco/Umbraco.Commerce.Issues/issues/440#issuecomment-1765848629