OK, if I factory defaulted the Play:1, connected direct to router with ethernet. Configure the Wireless Password while connected using the ethernet, then remove the ethernet cable and reset, it now DOES login to the Orbi WiFi and I can stream again.
Halelujah!
Until the next time it won’t login again of couse.
Not sure if I had to default the config or not, but am glad I seem to have a solution.