I'm unable to search Mail in iOS27. When I search for a term, including ones I know for certain should have recent results, it says "Searching..." but doesn't bring up any search results. I'm not seeing the prompts I used to see to filter the search to things like sender.
I've tried a tip of going into Settings > Apps > Mail > Search, turning the two toggles off, restarting my phone, and turning them on again. Sometimes this will allow search to (eventually) bring up results, but they're old - for example, for a retailer I know sends me emails every few days I'm only getting three emails from 2016 and 2019.