Sitecore licences have an expiry date.
If you've deployed up-to Azure using the wizard in the portal, how can you upload or attach a new licence file to prevent Sitecore returning an Invalid Licence exception?
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You can use a FTPS or Web Deploy client to connect directly to the filesystem on the deployed App Service instance. Open up your
.publishsettings file with a text editor, and you can see the endpoints to use and the username/passwords.
Ensure you use an FTP client that supports explicit TLS encryption (like WinSCP).