Dog Refusing to go outside

Hey everyone, looking for some advice.

My poodle is about a year and a half old and recently started acting weird when it’s time to go outside to potty. Before, he was totally fine and would go out without any issues.

Now when I open the door to let him out to the back of the house, he just stands about 10 feet away and stares at me. If I walk over to him, he runs and hides under the table so I can’t grab him to put the leash on and take him out.

It honestly feels like he’s testing boundaries or just choosing not to listen all of a sudden. Nothing major has changed in our routine, and I always go outside with him to supervise, so I’m pretty confused. He had already been doing something similar at night for a while, but now it’s happening during the day too.

Has anyone dealt with something like this?

Is this just a phase or something I need to correct?

And what’s the best way to fix this behavior?

Any help would be appreciated!