Help with JuiceBox 40 Pro WIFI Connection?

Hi,
To owners of JB 40 Pros...
Has anyone experienced difficulty connecting to their network?
Tried multiple times from app, reviewed support docs, spoke with support- they said it may be JB only works with 2.4GHz band? Now looks like I need to get educated on WIFI networking, a bit frustrating.
Any help or insight would be appreciated.
Thanks!