Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
The AI-generated reply is correct. You can always install a subscription version on more than one device. There is a limit to the number of simultaneous activations, though.
If you are the person who are supposed to use the second PC, just sign in to your account at https://account.microsoft.com/services and choose the Install option.
If you have Microsoft 365 Family or Microsoft 365 Premium, you can invite a family member to share the subscription with you. See https://support.microsoft.com/en-us/office/share-your-microsoft-365-family-or-premium-subscription-b389b9ce-3ae3-4a82-9017-39d79972fcba . The invited person can then install on their devices; see https://support.microsoft.com/en-us/office/someone-invited-you-to-share-their-microsoft-365-subscription-6a6c098e-1934-4436-9a94-69c92590da5b.