My office 365 is asking me to enter a product key or activate it out of no where. I bought the laptop off my dad 4 years ago and it's never done this before. I was always under the impression he had a lifetime key, however, something has happened. He doesn't have any old keys either.
Are there any ways to skip this?
If not, what's the cheapest way to get a key?
Impressions do not always align with reality. Most likely, it was an illegal key.
Yes, Microsoft caught up with you.