Hi,
Do you have a digital license or a pre-built PC (Dell, HP, Asus, etc.)? If you have a 25-digit physical license?
If you have a digital license that you purchased as an FPP (Full Packaged Product), you can activate it with a hardware change. https://support.microsoft.com/en-us/windows/reativando-o-windows-ap%C3%B3s-uma-altera%C3%A7%C3%A3o-de-hardware-2c0e962a-f04c-145b-6ead-fb3fc72b6665
If it's a license that came with a pre-built computer and has an OEM license, check in the start menu > settings > system > activation > troubleshoot. If it doesn't identify it, it may be that you installed an edition that doesn't have activation, since you installed Pro, it may have come with Home.
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Thanks