Unable to connect Chamberlain garage door opener via 5g internet

Finally it works.  I got TP-Link RE200 AC750 wifi extender on Amazon ($27). I setup only the 2.4g network on the extender, and after I set it up, went into the extender app and turned OFF the 5g network (as it had set itself up, even though I said skip during set up).  Still the garage door would not connect using the MyQ app on my phone.  So, I got out my ipad and downloaded the MyQ app (and yes, there are some differences between the phone and ipad versions).  Set my ipad to the 2.4 extender network.  I deleted the existing garage door opener in the MyQ app and started from scratch, adding it back in as a new opener.  Tada! it worked.  Hope this helps someone else.