Cannot reset license after reinstallation

I re-installed Windows OS to repair some issues.

Then I re-installed studio 2019 and found it is in trial mode. During re-activation, I found

(1) the software is not able to deactivate license online (no such option in trial mode).

(2) I tried to reset license but always failed and never receive a message saying it is successful.

I spent several hours but found no way to solve it. Could any expert give me a hand? Thanks a lot.

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