Can't re-connect Serie 6 Home Connect machines after changing WiFi

I upgraded my broadband and changed my router from ZTE to Linksys. Originally I tried using the same WiFi name and password but wasn't able to connect the machines to WiFi so I changed them.

The problem is that I can't reconnect my Serie 6 machines (washer, dyer, dish washer) to my WiFi using the latest version of Home Connect. I keep getting an error code H1086.

I've tried the following, with no success:

Restarted router
Power cycled machines
Deleted Home Connect app and reinstalled, most recent version 10.17.0
Delete old WiFi settings on machines
Split Wi-Fi into two bands 2.4 and 5 GHz
Changed original WiFi network name
Changed WiFi network password 
Made sure MAC filtering on WiFi is off

Bosch hasn't been able to help, so I hoping the great world of Redditors can help figure out how to re-connect my Bosch machines to my home WiFi.