Call in recently

When you’ve had to call in within the past few weeks, has your manager asked you for a reason?

I called in a couple weeks ago and my manager asked why. I said “nothing COVID related,” and she said they need to know.

Is this true? I really feel like it’s a privacy thing. Like, I don’t want to go into details. But I also feel like if I refuse to give an answer, they will either give me a hard time about not wanting to come in, or think I do have COVID symptoms. Has anyone else has this experience recently?