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Question:

I can not log or sign in the app anymore, the app shows only the registration form


Answer: 

The app's functionality depends if the license is correctly activated.  In this case the activation was lost.

Please send a copy of screen that appears on the app with the License ID to your local Fluke technical support.  
to find your local Fluke technical support :  
https://www.fluke.com/en-us/support/technical-support




With that info the support team can help on getting the license to be reset.
Perform the registration again and then all should be ok again.