Just transferred from a MacBook Air to a new Mac Mini and now I can’t search my email in outlook

I made the transfer on Monday of this week using the migration assistant. After this completed, all of my emails were there in Outlook but if I went to search for a particular email it wouldn't locate it. I tested it by searching for a word that I could see in one of my messages and no luck. I noticed that it would successfully locate emails I had received after the migration but anything before the migration was unsearchable. I also noticed that if I went to an old email and clicked on it, then it would become searchable. Anyone else ever experienced this? Anyone got a fix for it?