how to upgrade Sophos XG V18.0 30 days free licance to 1 year licance using licance file
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The Base license is expired. This means the firewall itself is not valid anymore. Base firewall is not a subscription, instead a license valid until year 2999.
You need to do a license transfer to get this appliance registered.
Did you purchase a total protect (with base license) or only a subscription? You should got a new serial number by your partner.
If so, you can register the new serial number in mysophos. Then do the license transfer and move the new license to this serial number. See: https://support.sophos.com/support/s/article/KB-000036692?language=en_US