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XGS license transfer RMA

Hello all

We are in the RMA process. In Sophos Central , when claim the firewall the license transfer is initiated automatically.

The warning message appear: 

Your faulty device will be unclaimed.
XXXXXXXXXXXXXX will become unusable after the license transfer. You can't undo this
Can somebody define " unusable after the license transfer"
What does it , exactly, mean?   Will it be functional for the period of time between replacement ( without the license) or it wil not be functional at all?
regards