Hello,
I installed n8n on Windows using npm install -g n8n.
When I start n8n, I see this error:
[license SDK] license activation failed: request/body/reservationId must match format "uuid"
400 Activation key is in the wrong format
I followed the steps to request a free community license key, but I never received the email (nothing in spam either).
Can you help me get my free activation key manually?
Thank you 
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Not receiving the license by email is an ongoing issue, which will be fixed on Monday if not before.
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I’m having the same problem.
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I still have this problem.
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The issue with not receiving the n8n license code is not resolved. I currently have it.
This is still not working. I have the same issue too.
I got it to work!! In my hosted instance I went to Personal / Workflows. I clicked the icon at right to create a folder and got an error message that I needed to be registered to create folders. I clicked to send a new key and a new key was sent that was different to the old. This new key worked.