@Mr_O 

Devices connecting through the RE220 will have a different MAC address so if you are working off a whitelist that may be an issue. You can determine what the new MAC address belongs to by referencing the first half as that will be the same, the second half is what should change.

@Tony 

Tonight I'm a lot closer.  I discovered that the MAC address on the RE220 sticker and the address that shows on a IP Scanner were not the same.  When I changed the White List address on the AX50 the Internet Status changed from Unknown to Connected.  The Network connection is properly set, the date and time have been properly set and firmware verified as Up-To-Date.  When I connect my MacBook Pro thru the EXT WiFi connections there are still a few webpages that will not open and some of my email acccounts will not open.  At this point it is not a big deal.

@Mr_O I ended up returning the RE220.  I mainly wanted it as a signal booster for my Ring Doorbell.  I was never able to connect.  I stood next to the doorbell and was able to connect other devices, strong signal.  The RE220 was returned to Amazon.

@Tony 

I am having a similar issue. My network is set up on a TP Link Archer 1750 with MAC address filtering. I purchased the TP Link RE220 to address a dead zone in my home. When I installed my RE220, it would not connect without disabling the ACL. Information on the internet suggested that you can set it up without ACL and then switch it on after set up. This I did, but while the ACL works through the Archer and the RE450 which addresses another dead zone, it fails to work through the RE220.

You stated the RE220 changes the MAC address, but you failed to explain exactly how we are to decipher what the new MAC address is which is passed to the network.

My question is this... If I have a TP Link product which extends the network of another TP Link product, why does it not work seamlessly with ACL? How am I to make it work when you do not provide information readily available to make it work?

@oldmixon 

Only the first half of the MAC address is of the original device, the second half is changed so you need to note that and modify your ACL to reflect the spoofed MAC addresses coming from the extender.