I had the same problem with a pixel 3a. Tried lots of things (including factory reset of the device, was not willing to factory reset the phone either (cc @Katecreatesit ) but i did get it to work without doing that. The following worked for me: using a non-pixel phone, login to app as admin and create a NEW network with 1) 5GHZ (ONLY) 2) WPA2 (ONLY) 3) A password that does not use commas (“,”) . I was then able to add THAT network to all devices and it was able to remember them normally. (i then deleted original network) I did not bother to go back and try to isolate which of the above 3 things really were required for this to work, but it did. pixel 4a here, (no 5g) worked for me.
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