Dear @skis99,

As you mentioned that your modem is running in bridge mode, please only have one router connected to the LAN port of your modem for the Internet connection.

A modem usually only caches one MAC address, so once it caches the MAC address of a router and provides IP address for the router to access the internet, it may fail to recognize another MAC address from a new router.

To set up the new router successfully, we just need to do one thing:

Power off the modem completely (take out the battery if there is) to remove its memory for MAC address if we want to use it with a new router.

If you use a cable modem, it's suggested to try the following steps (order is important):

1. Power off the modem completely, take out the battery if there is. (for cable modem, please also unscrew the coaxial cable)

2. When the Router is powered on, connect the Router’s WAN port to the modem via Ethernet cable.

3. Power the modem back ON. (for cable modem, leave the coaxial cable disconnected, wait 3-5 minutes before you screw it back)

4. Wait for the modem to reconnect and then check the Internet service.

Hope this information is helpful. Best Regards!