
In following situation, we could change the key via go to CA >Upgrade and Migration>Convert farm license type>Enter the new product key:
- If you have SharePoint Standard, then you can upgrade it to SharePoint Enterprise.
- If you are on SharePoint Standard Trial, then you can go regular SharePoint Standard or Enterprise.
- If you are on SharePoint Enterprise trial, then you can go only to regular SharePoint Enterprise edition.
If none of the above are satisfied, we suggest you rebuild the farm using the new key and migrate data .
More information:
Similar issue for your reference:
https://sharepoint.stackexchange.com/questions/169105/activate-a-new-license-key
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