@raenrfm
The API key that you see in your balenaCloud account is a temporary API key. This means that it is only valid for a certain amount of time, after which it will expire and be replaced with a new one. This is done for security reasons, to prevent unauthorized access to your data.

The good news is that you don't need to worry about keeping track of the temporary API keys. When you configure your Weewx installation to post data to balenaCloud, you will be given a permanent API key. This key will never expire, so you can use it to post data to balenaCloud for as long as you need to.