@TIMAI2 mentioned in his tutorial
CloudDB using own redis server (!important)
You are using the mit server...
Addendum
Setting up your own redis server may be somewhat onerous, if you just want to test this method out. Therefore if you do just want to test, you can setup the blocks to use the MIT provided redis server. If that is the case, in the Designer, set the RedisServer to
DEFAULT, the Token will magically appear. In the blocks, replace the<YOUR REDIS SERVER ADDRESS>content withclouddb.appinventor.mit.edu, and theYOUR REDIS SERVER PASSWORDwith the Token from the designerDISCLAIMER: You should only use the MIT redis server for demo/testing purposes. Excessive or heavy use may result in your app/s being blocked. There is also no guarantee of data retention, the server data may be cleared without notice.
Taifun