How do I get my wireless Logi keyboard that worked with my MacBook Pro to connect to my new minimac

Is this a BlueTooth keyboard?

Connect a Bluetooth device with your Mac - Apple Support

If it uses a proprietary USB wireless receiver, you will need to transfer that receiver from the old Mac to the new one.

Use a wired keyboard to set it up.

It may help to have logi software.

but if you meant to set it up, yes use a wired keyboard first, then proceed by have it detected - on bluetooth settings.

Normally it’s a straightforward process.

Did you unpair it from the MBP?

Aha, I bet that's it!:)