As already posted, you are locked to a different carrier.
If you check in Settings/Cellular/Network Selection should tell you the last successful carrier connect which should let you identify who it's locked to.
Carriers have to unlock for free and it should be just a phone call. If you can't identify the carrier, start with Rogers, then try Bell, then try Telus, etc.
That is unless your phone is blacklisted as being stolen. In that case, no one will activate. When you check the compatibility here: https://www.publicmobile.ca/en/bc/get-started it will also tell you whether the phone is blacklisted.
