I've read some threads about issues with SIM activated at Wal-Mart, you may need to let the mods know that's where you bought & activated it. Best of luck.
Check this link (in case there are differences between Huawei and Samsung setup on PM) and check your new APN settings: https://apn-canada.gishan.net/en/apn/public-mobile/huawei-p10-lite Restart your phone when you're done.
I also had to go into Access point names (APNs) and add Public Mobile. Name Public MobileMMSC http://aliasredirect.net/proxy/MB/mmscMMS proxy 74.49.0.18MMS port 80MCC 302MNC 220 Once I added that, it found the network.
Can you confirm texting from your new Pixel with new number, to any other # works?You only confirmed texting to your old phone so far. Just trying to confirm your outgoing service on new phone is GTG.